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  • 1. © 2005 - 2011 PrivateWave Italia SpA - All trademarks are property of their respective owners. All rights reserved. Demo version for evaluation only NOT FOR SALE: the PrivateGSM version you can purchase is sold within the Enterprise VoIP Security Suite solution.
  • 2. 1 User manual, September 2010 Contents 1. Introduction........................................................................................................................................ 3 2. PrivateGSM Demo installation pre-requisites ................................................................................. 4 3. Downloading and installing the software....................................................................................... 5 3.1. Installation via email/text message ..................................................................................................... 5 3.1.1. Download............................................................................................................................... 6 3.1.2. Installation.............................................................................................................................. 6 3.1.3. Activation ............................................................................................................................... 7 3.1.4. Selecting the access point after installation ............................................................................. 8 3.2. PC installation.................................................................................................................................... 8 3.2.1. Installation via Bluetooth......................................................................................................... 8 3.2.2. Installation via USB.................................................................................................................. 8 4. PrivateGSM Demo operating modes................................................................................................ 9 4.1. Opening the PrivateGSM menu.......................................................................................................... 9 5. Making a secure call with PrivateGSM Demo ............................................................................... 10 5.1. Secure number ................................................................................................................................ 10 5.2. Call modes....................................................................................................................................... 10 5.3. Secure call to phone numbers and contacts entering the PrivateGSM +801 prefix ........................... 11 5.3.1. Dialing a secure call .............................................................................................................. 11 5.3.2. Dialing a secure call from contacts........................................................................................ 11 5.4. Secure call to phone numbers and contacts using the PrivateGSM menu and not the +801 prefix... 12 5.4.1. Dialing a secure call .............................................................................................................. 12 5.4.2. Dialing a secure call from contacts........................................................................................ 13 6. Receiving a secure call..................................................................................................................... 15 7. Inviting a contact to use PrivateGSM Demo.................................................................................. 16 8. Verifying call security ...................................................................................................................... 18 9. Identifying a wiretapping attempt ................................................................................................ 19 9.1. Attempt to wiretap a call to a "trusted" contact.............................................................................. 19 9.2. Attempt to wiretap a call to a contact not yet saved as "trusted".................................................... 19 10. Checking the call in progress........................................................................................................ 21 10.1. Call status...................................................................................................................................... 21 10.1.1. Call status icons.................................................................................................................. 21 10.2. Call quality level............................................................................................................................. 22 10.2.1. Call quality level icons......................................................................................................... 22
  • 3. 2 User manual, September 2010 11. Call functions.................................................................................................................................. 24 11.1. Adjusting audio volume ................................................................................................................. 24 11.2. Turning speaker phone and microphone on and off ...................................................................... 24 12. Other functions and settings........................................................................................................ 25 12.1. Changing the Access Point ............................................................................................................ 25 12.2. Ending and re-starting an Internet connection ............................................................................... 25 12.3. Exit the application and end the Internet connection ..................................................................... 26 13. What you should know before you use PrivateGSM Demo ...................................................... 28 13.1. Standard call priority (voice) ........................................................................................................... 28 13.2. When doesn't PrivateGSM protect your data ................................................................................. 28 13.3. Call quality when moving............................................................................................................... 28 13.4. Networks and call quality............................................................................................................... 29 13.5. Rates ............................................................................................................................................. 30 13.5.1. Limited traffic rate plan disadvantages................................................................................ 31 13.6. Differences between secure and standard calls .............................................................................. 31 14. User license and license code........................................................................................................ 32 14.1. License code .................................................................................................................................. 32 14.2. Receive Only mode ........................................................................................................................ 33 14.3. Checking your user license............................................................................................................. 33 15. Most frequent VoIP network problems ....................................................................................... 34 15.1. PrivateGSM does not connect and does not let me make calls ....................................................... 34 15.2. The call interrupts with a failed connection error ........................................................................... 34 15.3. Only one caller can hear the other (one-way)................................................................................. 35 15.4. Dialing takes one or more minutes................................................................................................. 35 15.5. Frequent audio interferences ......................................................................................................... 36 16. Functional notes............................................................................................................................. 37 16.1. Incompatibility with other installed applications............................................................................. 37 17. How to contact us.......................................................................................................................... 38 Note: The following manual contains valid yet generic technical information. Some phone screen and menu references may vary according to the model.
  • 4. 3 User manual, September 2010 1. Introduction PrivateGSM, within the Enterprise VoIP Security Suite guarantees phone conversation security and privacy on mobile phones in a company network. The Demo version can be used to try how the UI works and what is the software operating principle. Once installed on a phone, the demo is able to encrypt all incoming and outgoing calls from/to other PrivateGSM users: thus, the software must be installed on the caller and the called party’s phones. To help you to build a contact network to make some tests, the Demo version has the “invite others” function. PrivateGSM uses VoIP technology (Voice over IP) and requires Internet access. Before making a secure call, PrivateGSM checks the exchange keys, letting callers personally check call security.
  • 5. 4 User manual, September 2010 2. PrivateGSM Demo installation pre-requisites Before installing the software, make sure the following requisites are met: Mobile phone compatibility. Check the Support section at: www.privatewave.com International text message capability. Check your service contract. A text message must be sent to a number in the United Kingdom to activate the product. Full internet access service. The phone service contract must include full internet access. WAP or MMS connections are not admitted. Note: NOKIA PC Suite must be installed on your PC to install the software via USB.
  • 6. 5 User manual, September 2010 3. Downloading and installing the software You can install PrivateGSM Demo on your mobile phone via email/text message or PC (via Bluetooth or USB port). Note: You can also download PrivateGSM to your phone at www.privatewave.com. In this case, enter the Trial section to download the file to the phone connected to Internet. Once the installation file download has completed, the installation wizard completes the setup. 3.1. Installation via email/text message The phone must have Internet access for this installation. To download, install and activate software via email/text message: 1. Open pages Trial and product Download at www.privatewave.com. 2. Read and accept the license and privacy consent terms. 3. Select your phone model. 4. Select option via email/text message. 5. Enter your email address or mobile phone number. Click Download to receive an installation email/text message. Click on the link in the message to download the software and launch the installation and activation procedure. Note: The text message is sent to a UK PrivateWave number (UK + 44). Therefore, your SIM card must be enabled to send international text messages and your credit balance must be able to cover these charges.
  • 7. 6 User manual, September 2010 3.1.1. Download   1. Click on the link 2. Confirm download 3. Check progress 3.1.2. Installation   4. Confirm installation 5. Confirm to continue 6. Select the phone memory
  • 8. 7 User manual, September 2010   7. Accept the license agreement 8. Enable auto-start 9. Activate technical support 3.1.3. Activation   10. Select the full internet access point 11. Select automatic activation 12. A text message is sent to a PrivateGSM number IMPORTANT We strongly encourage automatic activation. Manual activation lets you change advanced PrivateGSM settings but this is only recommended for expert users. Some automation, specifically designed to simplify product use, will be lost with manual activation. !
  • 9. 8 User manual, September 2010 3.1.4. Selecting the access point after installation After installation, select the full internet access point. If you selected an incorrect access point (with consequent difficulties in accessing the internet or sending the activation text message) you can change it later and re-launch product activation (see chapter 12.1 “Changing the Access Point”). 3.2. PC installation You can download the software to your PC and install it on your phone via Bluetooth or USB port (in the latter case, you will need the Nokia PC Suite Application Installation function). To download, install and activate software via PC: 1. Open pages Trial and product Download at www.privatewave.com. 2. Read and accept the license and privacy consent terms. 3. Select your phone model. 4. Select option via PC. Click Download, save the file on your PC and install it on your phone via Bluetooth or USB port. 3.2.1. Installation via Bluetooth 1. Send the file to your phone via Bluetooth protocol. 2. Open the message in your Inbox. The wizard is launched (see procedure screen 4 3.1 “Installation via email/text message”). 3.2.2. Installation via USB 1. Connect your phone to the PC via USB port. 2. Run Nokia PC Suite, select your phone and install the software using the Application Installation function. 3. The wizard is launched (see procedure screen 4 3.1 “Installation via email/text message”).
  • 10. 9 User manual, September 2010 4. PrivateGSM Demo operating modes If you selected auto-start during installation, PrivateGSM will automatically activate each time you turn on your phone (hidden in the background). When an Internet connection is available, you can: • Open the PrivateGSM main menu. • Receive and make secure calls. • End the connection without exiting the application. • End the connection and exit the application. IMPORTANT To make a secure call, the called party must be running PrivateGSM software and be connected to the Internet as well!! 4.1. Opening the PrivateGSM menu All other application functions are accessible from the PrivateGSM menu. To open the PrivateGSM menu: 1. Dial “801” and press the dial button 2. The PrivateGSM menu appears. Click Hide to return the application to thebackground
  • 11. 10 User manual, September 2010 5. Making a secure call with PrivateGSM Demo 5.1. Secure number Calls with PrivateGSM are simply identified by the “+801” prefix in front of the number to be dialed including the international prefix without zeros. For example: “+801 44 333 1234567” +801 PrivateGSM prefix, including ‘+’ 44 International country code for UK without zeros 333 1234567 Phone number Note: For quick dialing, we recommend you save numbers with the +801 prefix as "secure" contacts in your phone book. 5.2. Call modes PrivateGSM lets you: • Make secure calls to phone numbers and contacts using the PrivateGSM +801 prefix. In this case, you need not open the main menu if the application is on in background. • Make secure calls to phone numbers and contacts without entering the PrivateGSM prefix by using directly the application menu.
  • 12. 11 User manual, September 2010 5.3. Secure call to phone numbers and contacts entering the PrivateGSM +801 prefix 5.3.1. Dialing a secure call You can dial a secure call by entering the “+801” prefix before the number to be dialed, including the international country code without zeros. To dial a secure call complete with prefix: Enter the “+801” prefix before the number and press the dial button 5.3.2. Dialing a secure call from contacts You can call a number previously saved in the phone book with the PrivateGSM prefix (see chapter 5.1 “Secure number”).
  • 13. 12 User manual, September 2010 To make a secure call to a contact saved in your address book with the PrivateGSM prefix: Select a "secure" contact and press the dial button 5.4. Secure call to phone numbers and contacts using the PrivateGSM menu and not the +801 prefix 5.4.1. Dialing a secure call You can make a secure call from the PrivateGSM menu by simply entering the number complete with international country code (i.e.: +44 for UK) and pressing the dial button. Note 1: On devices with OS Symbian 9 5th ed. (touch screen) select Type number in Options menu: a virtual keyboard will appear. Note 2: Using this method, the call will not leave any indication in your phone register. Suggestion: If you intend to frequently make secure calls to the same number, add it to your phone book with the PrivateGSM prefix (see chapter 5.1 “Secure number”).
  • 14. 13 User manual, September 2010 To dial a secure call using the PrivateGSM menu: 1. Dial “801” and press the dial button 2. Enter the phone number complete with international country code and press the dial button 5.4.2. Dialing a secure call from contacts You can make secure calls from the PrivateGSM menu by simply selecting a contact from your phone book. Note: Using this method, the call will not leave any indication in your phone register. Suggestion: If you intend to frequently make secure calls to the same number, add it to your phone book with the PrivateGSM prefix (see chapter 5.1 “Secure number”).
  • 15. 14 User manual, September 2010 To dial a secure call to a contact using the PrivateGSM menu:   1. Dial “801” and press the dial button 2. Select Secure call 3. Select a contact and press the dial button
  • 16. 15 User manual, September 2010 6. Receiving a secure call PrivateGSM must be on and you must be connected to the Internet to receive a secure call. Note 1: A secure call has a ring tone other than a standard call and can be answered or refused. The ring tone is set by PrivateGSM and cannot be customized. Note 2: Regardless of the license status, if PrivateGSM is correctly installed (on with connection available) you can always receive calls (see chapter 14 “User license and license code”). To receive a secure call: Accept the secure call by pressing the dial button
  • 17. 16 User manual, September 2010 7. Inviting a contact to use PrivateGSM Demo You can invite a contact from your phone book to use PrivateGSM. The contact will receive a text message with a link, inviting him to install the product. To invite a contact from you phone book:   1. Select Invite others 2. Select a contact 3. Confirm invitation delivery The invited contact need only click on the link in the message: if the mobile phone is compatible, the wizard launches (see procedure screen 4 3.1 “Installation via email/text message”).
  • 18. 17 User manual, September 2010 To accept an invitation to install PrivateGSM: 1. Click on the link: the installation wizard will be launched Note: The “Invite others” option is available only for the Demo version, in order to allow users to build a contact network to make secure calls.
  • 19. 18 User manual, September 2010 8. Verifying call security PrivateGSM Demo uses an encryption and security system based on ZRTP protocol. This protocol also includes "human" verification of the two key exchanges displayed at the beginning of a call. Key exchanges are made up of two words in English, randomly generated for each call. The key exchanges displayed on the two phones must be verbally compared by the two callers to guarantee call security. To verify call security:  Matching key exchanges: the call is secure!  1. The caller reads his key out loud 2. The called party makes sure it matches his Suggestion: After making sure the key exchanges match and that the called party is the person you want to contact, save the contact in the phone book as “trusted” by clicking Trust. This way, you need not verify the key exchange whenever you call this contact (trusted) in the future. Key exchanges are no longer highlighted in orange. Security is already guaranteed. Thus, in normal conditions, subsequent communications with a "trusted" contact can start without the need of verbal verification. Keys are highlighted in orange and should only be verified in the event of wiretapping attempts or changes to one of the two phones' configurations. In this case, the keys must be verbally verified or the call immediately interrupted.
  • 20. 19 User manual, September 2010 9. Identifying a wiretapping attempt 9.1. Attempt to wiretap a call to a "trusted" contact If a third party attempts to wiretap a call to a previously verified contact saved as trusted, PrivateGSM automatically detects the wiretapping attempt, interrupts the call and displays the following security alert. Wiretapping attempt alert After receiving a security alert, you must always verbally re-verify the key exchanges and re-save your contact as trusted for future calls (see chapter 8 “Verifying call security”). IMPORTANT The security alert may even be displayed when there is no wiretapping attempt but when your contact changes his phone number or phone. It may also be displayed when the software is re-installed on one of your trusted contact's phones. You must always re-verify contact security after a security alert. ! 9.2. Attempt to wiretap a call to a contact not yet saved as "trusted" In the event a third party attempts to wiretap a call to a contact not yet saved as trusted, PrivateGSM displays two different key exchanges on the two phones. The callers should verbally verify the differences between the two key exchanges and interrupt the call.
  • 21. 20 User manual, September 2010  NON matching key exchanges: wiretapping attempt in progress!  1. The caller reads his key out loud 2. The called party verifies that keys do NOT match and interrupts the call!
  • 22. 21 User manual, September 2010 10. Checking the call in progress During a secure call, PrivateGSM displays: • key exchange status at the beginning of the call • connection quality 10.1. Call status To establish a connection, PrivateGSM completes three phases; an icon shows on the screen the call status: Exchanging ZRTP keys 10.1.1. Call status icons Red light Starting the connection Connection not yet established. This step may take several seconds (see chapter 13.6 “Differences between secure and standard calls”).
  • 23. 22 User manual, September 2010 Yellow light Key exchange Connection established but ZRTP keys are being exchanged. Green light Secure call established Connection established and secure. You can now speak in a secure way. 10.2. Call quality level Some factors that affect the GSM network (i.e.: GPRS use, poor signal, frequent radio cell changes, roaming), could decrease call quality, increasing voice delay. An icon shows the current call quality level: Poor connection quality 10.2.1. Call quality level icons Poor connection quality
  • 24. 23 User manual, September 2010 Average connection quality Good connection quality Note: If connection quality remains poor, we suggest you seek better network coverage or connect to a better broadband Wi-Fi access point.
  • 25. 24 User manual, September 2010 11. Call functions 11.1. Adjusting audio volume Adjusting secure call volume is the same as adjusting standard call volume. To adjust the volume during a secure call: • Use the volume key on your phone (if applicable). • Use the scroll key, scrolling left to lower volume or right to raise it. 11.2. Turning speaker phone and microphone on and off You can turn on your speaker phone or mute your microphone during a call. To turn speaker phone on/off during a secure call: • Click Options > Activate loudspeaker To turn the microphone on/off during a secure call: • Click Options > Mute microphone Speaker phone and microphone menu
  • 26. 25 User manual, September 2010 12. Other functions and settings 12.1. Changing the Access Point To change the Access Point, select Settings > Default access Point from the PrivateGSM menu. Restart the application for change to take effect. PrivateGSM automatically reconnects after the change. IMPORTANT WAP or MMS access points cannot be used.! To change the access point: 1. Select Default access point 2. Select the access point 12.2. Ending and re-starting an Internet connection You can end the Internet connection to stop receiving secure calls. The application remains in the background and can be started at any time by starting a connection.
  • 27. 26 User manual, September 2010 To end and re-start an Internet connection 1. Select Options 2. Select Go offline/Go online IMPORTANT You cannot receive or make secure calls when you are not connected to the Internet.! 12.3. Exit the application and end the Internet connection To stop receiving secure calls, exit the application, automatically ending the Internet connection. To re-launch the application, open the mobile phone menu and select PrivateGSM .The connection is automatically re-started. IMPORTANT You cannot receive or make secure calls when you are not connected to the Internet.!
  • 28. 27 User manual, September 2010 To exit the application and automatically close the connection: 1. Select Options 2. Select Exit
  • 29. 28 User manual, September 2010 13. What you should know before you use PrivateGSM 13.1. Standard call priority (voice) If the user receives a standard call (voice) during a secure call (VoIP), the following may occur: 1. The user accepts the voice call: since this channel takes priority over VoIP, the secure call is automatically interrupted. 2. The user refuses the voice call: the VoIP call remains connected and the user can continue the secure conversation. 13.2. When doesn't PrivateGSM protect your data PrivateGSM cannot protect your conversations in the following cases: 1. Wiretapping by bugs placed in your home, office or car. 2. Wiretapping by long distance directional microphones. PrivateGSM cannot protect you from the following geographic tracking systems: 1. GSM mobile phone locators 2. GPS locators Note: We suggest you consult security experts to protect yourself against these types of devices. 13.3. Call quality when moving It may take longer to establish a connection or experience short audio interruptions when travelling by car or high speed train. This is because you are switching from one GSM network radio cell to another. Call quality depends on the local infrastructures the phone operator uses. For example, in the suburbs, the GSM network is made up of less cells but with higher coverage; switching from one cell to another is less frequent (i.e.: highway). Contrarily, in metropolitan areas, the
  • 30. 29 User manual, September 2010 GSM network is made up of more cells but with lower coverage; switching from one cell to another is more frequent (i.e.: expressways and ring roads). Note: No perceivable vocal defects were demonstrated in tests conducted at 150 km/h with PrivateGSM. 13.4. Networks and call quality Secure calls with PrivateGSM use VoIP technology that exploits an Internet connection to make a call via TCP/IP and UDP packet exchange. Thus, data packets containing voice, encoded and encrypted information are routed on the network during a call. PrivateGSM secure calls thus require an open Internet connection without any firewall or restriction by the caller or called party. Mobile phone operators typically offer two types of Internet access with two different Access Points: • Full Internet access: supports all transmission protocols. Required by PrivateGSM. • WAP/MMS access: does not allow PrivateGSM to work. Following is a list of network types, ordered by quality, band width1 and latency2 : Technology Wi-Fi HSD PA UMTS EDGE GPRS Satellite Quality Best Worst 1 Band width determines the amount of data transmitted per second. 2 Latency determines the time required for data to reach its destination.
  • 31. 30 User manual, September 2010 Note: To check your mobile phone network, check the symbol next to the signal bar: 3.5G network (HSDPA) Suggestion: Use Wi-Fi when available. There are no additional access costs and call quality is definitely better. For further information, see chapter 12.1 “Changing the Access Point”. 13.5. Rates PrivateGSM secure calls use an Internet connection thus data traffic is charged. Costs depend on the rate set with your phone service provider. To receive secure calls, PrivateGSM must keep an Internet connection open. You should, therefore, choose a rate that lets you stay online as long as you need to receive and make secure calls (i.e.: 24/7, or business hours). Note: We suggest you consult your operator to set a flat rate tied to your connection needs. Note: When using PrivateGSM abroad, make sure you have a data traffic rate plan that lets you check costs.
  • 32. 31 User manual, September 2010 13.5.1. Limited traffic rate plan disadvantages Data limited traffic rate plan You pay according to data traffic when online. On average, PrivateGSM exchanges data packets for a total of 2MB a month. This is calculated considering average band width between 100k/minute and 200k/minute. Thus 1MB of Internet traffic equals a minimum of 5 minutes to a maximum of 10 minutes. Time limited rate plan You pay according to connection time. These planes are unfavorable and not recommended for PrivateGSM use. 13.6. Differences between secure and standard calls Delays in establishing a connection To establish a connection with the called party, PrivateGSM needs from 5 to 60 seconds based on the caller and called party's Internet connection qualities. Voice delay Unlike standard calls, VoIP secure calls may be subject to voice delays from 1/5 of a second to a maximum of two seconds. This depends on the technology adopted by the data transmission network. The better the connection, the shorter the voice delay. Different ring tone PrivateGSM secure calls use different ring tone than standard calls (not customizable). Battery charge Internet connection may lower your phone's battery life. Average mobile phone battery consumption may increase from a minimum of 5% to a maximum of 35% based on the type of network used by the Internet connection. Note: A Wi-Fi network consumes more than a 3G network. A 3G network consumes more than a 2G network.
  • 33. 32 User manual, September 2010 14. User license and license code PrivateGSM Demo can work in two different modes: • Full: you can both make and receive secure calls in this mode. • Receive Only: you can only receive secure calls in this mode. Upon first installation, PrivateGSM is set to Full mode for a 15-day trial period. At the end of the trial period, the software automatically switches to Receive Only. Note: In a contact network, you only need one contact with a Full license. Other PrivateGSM users can have Receive Only modes. To expand the contact network, invite contacts using the specific PrivateGSM function (see chapter 7 “Inviting a contact to use PrivateGSM Demo”). Each contact must have a mobile phone model compatible with the software. 14.1. License code – status icon License status is shown by the license icon that appears in PrivateGSM menu: Trial period Full mode Receive Only mode Waiting for server response after license code registration.
  • 34. 33 User manual, September 2010 1. User license expired: you are asked to enter a new license code. 14.2. Receive Only mode Receive Only mode starts when the trial license expires. It lets you continue to receive secure calls for as long as the software is installed on your phone. 14.3. Checking your user license To check your current user license: 1. Select License 2. Check your user license
  • 35. 34 User manual, September 2010 15. Most frequent VoIP network problems 15.1. PrivateGSM does not connect and does not let me make calls Problem PrivateGSM does not correctly go online and generates an error during registration/connection. • Diagnostics The access point in use is incorrect and/or PrivateGSM is connected to a network that is not correctly set. Possible solution - Check whether the phone can access the Internet, opening any web page. - Check whether the access point in use is a full Internet connection and not a WAP or MMS connection. You can only use PrivateGSM with a full Internet connection. - Check whether the Wi-Fi network you're connected to supports TCP/IP and UDP protocols. Internet connections with proxy servers do not work with PrivateGSM and firewalls need to be opened to allow internal networks to work with a proxy server. - Check whether your SIM card balance (top-up) is sufficient. - Check whether Internet connections are enabled on the SIM card. Some phone operators require you set a specific rate plane for Internet access which must be requested by the user and confirmed by the operator. 15.2. The call interrupts with a failed connection error Problem PrivateGSM is correctly online and lets you make/receive a secure call but the call never gets past the Exchanging keys phase (yellow light). PrivateGSM interrupts the call with a failed connection error and you cannot hear the called party. • Diagnostics The access point in use is incorrect and/or PrivateGSM is connected to a network that is not correctly set.
  • 36. 35 User manual, September 2010 Possible solution - Check whether the phone can access the Internet, opening any web page. - Check whether the access point in use is a full Internet connection and not a WAP or MMS connection. You can only use PrivateGSM with a full Internet connection. - Make sure the firewall allows UDP protocol output. - Change access point. 15.3. Only one caller can hear the other (one-way) Problem PrivateGSM is correctly online and lets you make/receive a secure call. It reaches the Secure call established (green light) status, exchanging keys, but only one caller can hear the other. • Diagnostics The caller's PrivateGSM has audio problems, due to incorrect settings. For example, it is using a WAP access point and not a full Internet access point or a network with incorrect settings. Possible solution - Check whether the access point in use is a full Internet connection and not a WAP or MMS connection. You can only use PrivateGSM with a full Internet connection. 15.4. Dialing takes one or more minutes Problem PrivateGSM makes/receives a secure call but remains in the Starting a connection phase (red light) for one or more minutes, hanging up with a failed connection message. Re-dialing, the call sometimes goes through.
  • 37. 36 User manual, September 2010 • Diagnostics PrivateGSM uses the Internet via a radio frequency range provided by the operator or Wi-Fi connection in use. Radio frequencies are subject to data packet loss in certain environmental conditions such as if you are close to a large wall, a repeater or in the event of network overload, for example, during a public event. During a voice call, a minimum level of data packet loss is negligible for voice quality but may be a determinant factor for that part of the signal dedicated to the phone system (i.e.: SIP/TLS protocols used to make a call, receive a call, end a call, and so on). Data transmission may thus be difficult during the start/end call phase even if the phone displays a good signal level. Possible solution - Check whether the two callers are surrounded by radio disturbances. - If using PrivateGSM in a crowded place, decide whether you should switch from the UMTS network to the GSM network. In fact, a UMTS network that works at 2,100 MHz is more crowded than a GSM network that works at 900/1,800 MHz. 15.5. Frequent audio interferences Problem PrivateGSM calls are subject to frequent audio interruptions or interferences and the conversation is difficult. • Diagnostics Internet connections are often overloaded and mobile phone operators do not have enough bandwidth. In these cases, establishing a connection may be difficult or impossible or, once established, audio may be suddenly interrupted and similar problems occur. Possible solution - Make sure the network is actually overloaded: open a web page (N.B.: pick a web page you do not frequently open). A page that does not load or loads slowly, timing out, indicates that the network is overloaded and cannot be used for secure calls.
  • 38. 37 User manual, September 2010 16. Functional notes 16.1. Incompatibility with other installed applications PrivateGSM uses APS (Audio Proxy Server) and VAS (VoIP Audio Service) which, if installed on your phone since used by other applications (i.e.: Fring, instant message software), may interfere with correct software operations. In this case, uninstall the other applications and re-install PrivateGSM.
  • 39. 38 User manual, September 2010 17. How to contact us Visit us at: http://www.privatewave.com Contact our technical staff: tel: +39 02 911930891 Monday through Friday, 10 AM to 12 PM, 2.30 PM to 4.30 PM. email: support@privatewave.com We remind you that the PrivateGSM Demo version is for evaluation purpose only, to show how the software works. The full version on sale is part of the Enterprise VoIP Security Suite solution for fixed- mobile encryption in a company network. For more information or technical details on the Enterprise VoIP Security Suite, get in contact with our sales team: email: sales@privatewave.com