Issabel Training Doc

avanzada 7 – Training department
INDEX
2. INTRODUCTION TO
VOICE OVER IP
1. INTRODUCTION TO
ISSABEL
3. COMPONENTS 6. SECURITY
5. ADVANCED SETTINGS
7. MONITORING
AND RECOVERY
8. EXTRAS
4. BASIC INSTALATION
AND SETTINGS

Introduction to Issabel
 Issabel is an unified communication solution which includes
• IPPBX – IP Telephony
• Electronic mail service
• Fax
• Instant messaging
• Unified messaging
 It’s also a platform that allows an integration with other functionalities for
them to combine with telephony and therefore obtain additional benefits.
What is Issabel?

 Issabel is a free licensed software under version 3 GPL:
https://www.gnu.org/licenses/gpl-3.0.html
 This means the software can be copied, distributed and modified freely.
 There are no commercial versions or double licensing.
 In case there are any doubts: Issabel can be downloaded free of charge
Licensing at Issabel

 An open source solution has licensing.
 The license assures that your code may be available to any developer.
 Open source solutions have support in developing communities not directly associated to
the business management that supports it.
 However, they create a perfect inertia, all have access to the code!
Why Open source?

Why Open source?
 License GPL GNU doesn’t allow the solution or it’s functionalities to have a
monetary value.
 The execution of an open code solution can be made with 1, 100 or n users,
none of them will pay for an additional license.
 This is one of the main difference with some commercial distributions, in which
licensing has a cost and a range of users per license.

Why Open source?
 The advantage of using Open source solutions is mainly in it’s capacity of available
support(https://forum.issabel.org/d/5357-instalacion-cdr-asternic-free).
 When it comes to a big community, tasks for resolution of issues and improvements
are immediate.
 One or more developers of a community can help improve the code, this allows the
corrections of an open source solution to be quick and efficient.

Why Open source?
 A user of a commercial solution could have the solution to a problem, but
probably he can’t contribute to its solution.
 An open source solution allows to make customizations for a client for an
affordable cost of development.

 It’s globally distributed as an ISO image.
 Enable the development of new functionalities and integration with
other software.
 It’s based on the Web and it permits access to the administration
interface from any point and any operating system.
 It allows easy configuration from the web administration interface
and has a web user interface.
About Issabel

About Issabel
 It provides support for mostly all telephony hardware including the following
drivers: dahdi, wanpipe-util, chan_khomp y Rhino.
 From version 3.0 onwards, Issabel will stop using FreePBX as a setting
component of telephony functionalities and will use a code developed by
Issabel LLC.
 This will allow to have “Multi Tenant” functionality and a better control over the
integration of functionalities and a safety solution.

About Issabel
Market Placa and Add-ons programmes permits to include third party
developments on Issabel as adittional modules.
 Call Center Module with communication protocol to allow the development
integration of third parties.
 Issabel Web Services, a way to standardise communication between any
development and Issabel.

Brief history
 Initially it wasn’t a distribution but a report interface for Asterisk calls.
 In December 2006 the first version in distro format was launched under the
name of Elastix.
 It gained popularity for its ease of use and the use of graphic interfaces for
managing and settings.

Brief history
 It was nominated for three consecutive years for the CCA awards of
SourceForge.
 Winner of the Best Product of the Year 2010, 2011 y 2012 according to the
telecommunication magazine TMC (USA).
 It was honoured with INTERNET TELEPHONY distinction Excellence Award
years 2011 and 2012.
 In 2016 3CX bought Elastix and the community makes a fork to create Issabel.
 Currently, it’s one of the distros based in Asterisk market leader.

Unified communications
 A unified communication solution integrates all communications for them to
work natively together.
For example:
 The telephone is answered by Asterisk (telephony) and in case it’s a fax
document, the control passes on to Hylafax (FAX) which receives the
document and sends it out by e-mail through Postfix to its recipient.

 A unified communication solution should not need additional modules nor
hardware to convert the communication motor of the business to a Hybrid
server.
 Productivity improvement: time saving, paper, better access to shared
information.

Issabel functionalities
• Call recording
• Voicemail
• Flexible and Configurable IVR
• Text to Speech support
• Extension settings by batches
• Echo cancellation by software
• IP phone provisioning by Web
• Video telephones support
• Interface for HW detection / DHCP Server to
serve Dynamics Ips
• Web operator panel
• Call parking
• Call detail record (CDR)
• Billing and call report
• Channel use report
• Calls in queue support
• Conference Managements with virtual rooms
• Support for SIP and IAX among others
• Supported Codecs: ADPCM, G.711 (A-Law & μ-
Law), G.722, G.723.1 (pass through), G.726,
G.729, GSM, among others.
• Analog interfaces support (FXS/FXO)
• Digital interfaces support (E1/T1/J1) through
protocols PRI/BRI/R2
• Caller identifier
• Multiple trunks support
• Incoming and outgoing calls route with dialing
patterns support
• Follow-me support
• Ring groups support
• Paging and intercom support
• Time conditions support
• PIN sets support
• DISA
• And more…

Other functionalities
 Issabel has a big amount of functionalities that can be activated with a free of
charge additional license.
 Other functionalities include the capacity of recognizing and synthetizising
speechs (ASR / TTS), advanced implementations of IVR (Interactive Voice
Response).
 Since it’s an open source solution, there is a total flexibility to interact with the
information systems each enterprise use.

 Firewall Module
 Security Module
 Add-ons Module – Issabel Market Place
 Hardware detection Module – via interface
 VoIP suppliers Module

 End Point Configurator
 Spam filter for Issabel mail services
 Web Conference Module
 Call Center Module

Issabel Architecture

Versioning of Issabel
Issabel has the following developing process:
 Future functionalities are stablished which are requested by the
market.
 Security requirements are stablished.
 Critical and minor corrections of the current version are stablished.
 The development status of Asterisk, the telephony motor inside
distro, is revised.

 Once these points are analyzed, new projects and technological
partners requirements are reviewed (for example: hardware that
requires specialized drivers).
 Finally, a planification is stablished, prioritizing the development
according to the license GPL-GNU v2.
 The development that hasn’t got the same license is redirectioned to
other projects.

The process for a new version:
1. Initial development
2. Launching of an Alpha version
3. Launching of a Beta version
4. Launching of an RC (Release Candidate) version
5. Launching of a stable version

Alpha version
A version ready to try in which there are a high percentage of bugs and
corrections to make. Generally, this version is not launched to the community.
Beta versions
A version with a high degree of corrections which is ready to be launched to the
community for testing. There can be several Betas (1…n). It’s not a version for
production.

RC Version
It’s a candidate version to be a solid version. Tests are made inside the
community to prove there are no bugs or critical issues. There can be many RC
(1…n). It’s not a version for production.
Solid versions
A stable version ready to be implemented in a telephony operation. This version
gets support through the Issabel official channels.

Issabel Hardware

Issabel Hardware
 Issabel works in designing and engineering of unified communication servers
since 2007
 This approach is aimed to create products dedicated to IP telephony, IP voice
and the integration of multiple functionalities.
 Appliances Issabel are native equipments for communications SIP and IAX
with the possibility of TDM, Digital and GSM integration.

Issabel Hardware
 All Issabel equipments are native for SIP, but while operators keep changing
the technology, we will still be needing legacy communication integration.
 An advantage is that Issabel equipments are designed to add only legacy
communication integration.
 This way, there are no chances that the telephony hardware made by a
manufacturer may not be compatible and may create IRQ conflicts in the
server.

Issabel Hardware
Legacy telephony integration
 Integration is done with cards to a PCI, PCIe port, both for analogic and digital interfaces.
 Inside each of these categories, there are subclases:
Analogic:
FXO
FXS
Digital:
E1/T1/J1
BRI

Issabel Hardware
 There are manufacturers that design their hardware in a modular way, so they
can be expanded.
Ports
Sockets for modules
FXS Module
(green)
FXO Module
(red)
Power supply connector
Sangoma TMD Card Model A20101

Issabel Hardware
IHCP (Issabel Hardware Certification Program)
 The Issabel Development Team work with several manufacturers to include their hardware controllers.
 Moreover, Issabel has got a program which tests the whole functionality to certify the interoperability with the
software.
 This programme is called Issabel Hardware Certification Program (EHCP).
 There are many models and card manufacturers which are compatible and included in the distro.

Issabel Hardware
 Issabel has tested the support for many models and card manufacturers. The
following ones are the officialy supported models as of today:

Introduction to VoIP
What is voice over IP?
 Voice over IP or VoIP consists in transfering voice on IP protocol.
 This concept is quite wide and there are a lot of alternative protocols.
 It’s really a soup of protocols.

What is voice over IP?
 The voice is packetized to be transmitted over an IP network.
 IP protocol wasn’t specially designed to transport voice.
 However, thousands of people all over the world work everyday to make it a
minor problem.

Advantages of Voice over IP
 Better use of the resources
 Less costing equipments
 Centralized maintenance and management
 Mobility

Advantages of Voice over IP
 It only works on Internet.
 Expensive and hard to use depots.
 Current infrastructure needs to be renewed.
 For every IP telephone, it needs wiring for a network port in every workstation.

Voice over IP signalling
How can Carlos speak with Alice?
Alice
Carlos
Bob
Carlos?
Carlos

 Same as with traditional telephony, VoIP calls need to be signalized.
 There are some alternative signalling protocols as SIP, H323, MGCP, IAX2,
among others.
 The most popular ones for Asterisk are SIP and IAX.

 Regarding SIP or H323, many people get confused and think that voice is
transmitted with this protocol but it’s just a signal.
 SIP (Session Initiation Protocol) is the one that has gained a lot of power
currently.
 There are efforts so that soon it can undestand how to deal with texts, and
therefore the functionality of many developments about IP voice would be
increased.

Media in IP Voice
 Voice transportation is done with protocol RTP.
 RTP means Realtime Transport Protocol.
 Protocol RTP is the one that transports the encoded audio.
 RTP is carried on UDP.

Signalling and media in IP voice
 Let’s talk a bit more about SIP + RTP combination.
 SIP stablishes the session (ports, codecs, addresses, etc.) and once it’s in
accordance with the other edge, fragments of voice is transported in frames
inside of RTP packets.
 These travel inside UDP packets and finally these last ones inside IP
packets.
 SIP protocol works listening to the requests of the UDP 5060-5062 ports by
default.

Internet Protocol – IPv4 y IPv6
TCP UDP
SIP RTP XCAP
HTTP
MSRP
SDP
Communication sessions
(Audio, video, text)
Presence and chat
Web Socket

A call made from an IP telephone to our Issabel Server is in reality a SIP message
that is trying to start a session and whose destination is the IP address and the port
UDP 5060 of the server UCR.
In contrast, if our Issabel Server sends a call to an endpoint, it will send a SIP
message to the IP address and UDP 5060 port of the phone.

Once the call is made, the audio stream is exchanged by the RTP protocol
in the 10,000 to 20,0000 UDP ports (by default).

IAX Protocol
 IAX2 is developed for Asterisk, full of updates, very simple and light,
compared to other protocols.
 It’s like a hybrid as it signalizes and transports the voice at the same time.
 IAX2 uses a unique port UDP: 4569 (by default)
 Voice traffic is transmitted in bands, what makes IAX2 an almost transparent
protocol to firewalls.

IAX Protocol
 IAX2 was developed by Mark Spencer and it’s an open source protocol
owned by Asterisk.
 This protocol is not spread in the industry for other distributions.
 This protocol is excellent to create trunks between two IP-PBX in a business
being these ones faraway; there are no problems regarding NAT.

IAX Protocol

SIP vs IAX
 Although both are signalling protocols, the market has set a guideline on the
usage of both of them.
 The 99% of the IP phones are manufactured based on SIP protocol.
 In the other side, IAX is very usefull when it comes to creating trunks since a
simple link allows to send data and signalling through multiple channels.

SIP vs IAX
 IAX in one hand, is limited to markets based on Asterisk. Sip is universal.
 Although there are softphones that use IAX, it’s not so common to see final
users using this protocol.
 This is related to the custom users have to lift the phone for a call.

Codification-DECodification
 To transfer voice on an IP protocol, the information to be exchanged may
undergo some transformations in its form and sequence.
 Voice → Microphone → Digitalization → Break up in packets
 The voice is an analog wave that needs to transform itself into a digital format
before being broken up in packets.

 To transmit the voice correctly, first it’s been encoded and then it’s put in
frames on RTP.
 Encoding is used to diminish the probability of error or even to minimize the
bandwidth used.
 To encode we use a codec, which is an algorithm.

Codecs are not exclusive of VoIP as they are also used in other types of digital
communications and for information storage.
The word codec comes from shortenning the words codification and
decodification.
Therefore, once the voice is digitalized, it will be encoded according to a CODEC
using 0 and 1 symbols.

On the next period, that stream of encoded information is broken up into packets
and it’s transmitted.
In the receiver, the packets are gathered up forming the original encoded flow, so
that it can finally be decodificated according to the CODEC used to encode by
the sender.
There are different codecs, each of them with pros and cons.

Issabel supports a big variety of codecs, but we will highlight the main ones to
set up and the ones used in our communications:
 G.711
 G.729
 GSM
 G.722
 G.726
 OPUS
 H.264
 VP8

Bandwidth consume
 Several protocols send additional data than just the voice.
 We have to keep in mind Ethernet, IP, UDP, RTP.
 This makes that the real bandwidth to transfer the voice may be bigger than the one
for the codec.
 For example, to transmit the voice using G.711, in theory, we should be using 64Kbps
but we actually use around 95.2Kbps BW.
 For other codecs with a higher compression, the overload is even more significant (in
percentage terms).

Bandwidth consume
RTP over UDP over IPv4 RTP over UDP over IPv6
head
head
cabecera cabecera head
head
head
head
head
head
head
head
Ethernet
IP
UDP
RTP
ethernet: 64-1522 bytes, head 30 bytes
Head IP: 20 bytes
Head UDP: 8 bytes
Head RTP: 12 bytes
IP+UDP+RTP= 40 bytes, Ethernet 30 bytes = 70 bytes head
head
head
cabecera cabecera head
head
head
head
head
head
head
head
Ethernet
IP
UDP
RTP
ethernet: 64-1522 bytes, Head 30 bytes
Head IP: 40 bytes
Head UDP: 8 bytes
Head RTP: 12 bytes
IP+UDP+RTP= 60 bytes, Ethernet 30 bytes = 90 bytes head

Bandwidth consume
 Real bandwidth for some codecs (using Ethernet) Chart:
* For these codecs, bandwidth may change.
Codec BW codec BW real (ethernet)
G.711 64 Kbps 95.2 Kbps
G.726* 32 Kbps 63.2 Kbps
iLBC* 15.2 Kbps 46.4 Kbps
GSM 13 Kbps 43.7 Kbps
G.729A 8 Kbps 39.2 Kbps

QOS
 Voice over IP requires in 90% of the cases a data network infrastructure.
 All the existing technologic differences regarding traditional telephony network
must be totally transparent for the users.
 We must ensure that the infrastructure can offer a quality of service similar to
the traditional telephony network.

QOS
Factors that affect QoS
 Delay
 Jitter
 Packets lost
 ECHO

Issabel Components
Hardware
Kernel (Linux)
Módulos
Drivers
DAHDI
LibPRI
Asterisk
Servidor web (Apache)
B.D.
MySQL
Openfire
A2Billing
FreePBX
Jitsi

Issabel Components

Issabel Components
Asterisk is an open source framework to develop communication
applications:
 PBXs.
 Protocol gateways.
 Conference servers, voicemail servers, music on hold, etc.
 A platform to develop call center systems.
Asterisk

Issabel Components
Asterisk
 It's part of Issabel's core.
 It's what supplies Issabel with all the functionalities regarding telephony (IP
PBX and Call Center Module).
 Asterisk by itself is not a PBX, but through programming and a
huge knowledge regarding low level software, it's possible for it to
become such device.

Issabel Components
Asterisk

Issabel Components
Asterisk
 Asterisk is a complex system.
 It's based in modules that provide specific functionalities.
 It's got setting files that describe Asterisk behaviour, log files and multiple
directories inside Linux where it does its work.

Issabel Components
Asterisk
 Learning Asterisk is outside the scope of this course.
 However, it's advisable for an administrator to have these knowledge in time.
 AFS and ADV courses have several chapters dedicated to a
deeper knowledge of Asterisk.

Issabel Components
Asterisk
 Issabel is in charge of this task, easing up the setting up work, so that we don't
have to worry about all the coding work at console level.

Issabel Components
VoIP Endpoint devices

Issabel Components
VoIP suppliers
 Currently, the number of VoIP telephony suppliers is increasing.
 The fact that we can hire a line and set it up in minutes in our Issabel server
has a huge value.
 A VoIP supplier can end up calls on any fixed or mobile telephone
subscriber in the world.
 One of the advantages of these kind of suppliers is the cost.

Issabel Components
VoIP suppliers
 Cheaper technology for its design.
 A growing number of business suppliers every year.
 Keeping in mind that we can use the Internet link, that our business most
probably already has, the cost for infrastructure is being lowered.

Issabel Components
VoIP suppliers

Issabel Components
VoIP suppliers
 Suppliers normally offer two types of connections:
 Through a “VoIP trunk”, direct to our network or to the server.
 Through the installation of a modem and then we are given a phisical wire
which is connected to a backbone for VoIP.
 While hiring this type of services, it’s important to be assured about the
bandwidth and the quantity of concurrent calls.

Issabel Components
Openfire
 A real time collaboration server.
 Apache Open Source License.
 Based on XMPP.
 Web settings and manegement.

Issabel Components
Jitsi Meet
 Videoconference Server and desktop sharing.
 Apache Open Source License
 Developed with Javascript with WebRTC..
 Web settings and manegement.

BASIC INSTALATION AND SETTINGS

Basic installation and settings
Installation from DVD
 It’s advisable to install the latest stable version of Issabel available on the
website of the project.
 To begin with the installation from the DVD, we must download the image file
(with iso extension), and record it in a blank disk.
 It’s important to record the iso using a specialized software for this purpose.

 A common mistake we do is to unzip the image and to copy the resulting
directory structure in a disk. In this case, we won’t have a boot CD.
 Once the installation CD is created, we must insert it in the DVD reader and
proceed to turn on the equipment.

 It’s important to verify that the server is set up to boot from a CD/DVD.
 This can be set up on the BIOS.
 The Issabel installer will appear on the screen.
 Once the installation DVD is created, we must insert it in the unity and proceed
to turn on the equipment.

Introduction to Linux
 GNU/Linux is an open source operating system.
 Asterisk and Issabel work on Linux
 To manage an Issabel central it’s not necessary to be an expert in
Linux but it’s useful to know about it.

Introduction to Linux – command line
 It’s a text interface between the user and the operating system
 It can be locally accessed
 It can be remotely accessed through protocol SSH (Secure Shell)
 SSH is an encrypted protocol

Introduction to Linux– basic commands
Command Description
ls It lists the files in the current directory.
ls -la It lists files and its atributes.
cd It changes the directory.
cd .. It changes the parent directory.
cat It shows the content of a file on the screen.
pwd It shows the current route.
cp It copies a file or a group of them.
mv It moves a file. It’s also used to rename files.
rm It deletes a file.
tail -f filename It shows the last lines of a file.
mkdir It creates a directory.
tar zxvf filename.tar.gz It unzips a file .tar.gz

Introduction to Linux– basic commands
Command Description
top It shows a real time report of all the processes that are being executed in the system. It can be
organized by memory or CPU consume. It’s very useful for diagnosis.
find It allows to look for files.
vim It’s a program to see and edit plain text files.
ifconfig It shows information of the network interfaces and it allows you to change them temporarily.
ps -aux It shows a report of all the processes that are being executed in the server.
reboot It restarts the equipment.
shutdown -h now It turns off the equipment.

Introduction to Linux – file system
 Directory tree structure
 All of them begin with the root → /
 Important directory in Issabel:
• /etc/asterisk: it saves Asterisk settings
• /var/www/html: where Issabel is located
• /var/lib/mysql: mysql database
• /var/log: log files

Introduction to Linux – permits
 Each file belongs to one user and one group.
 There are three level of permissions: user, group, other
 Permissions can be read (r), write (w) and execution (x)
 For example: rwxrw-rw- juan elastix file
• In this case, the file belongs to juan and to elastix group. The permissions for juan are rwx, elastix group rw and others rw.
• r=4, w=2 y x=1
 Examples:
• 766 = rwxrw-rw-
• 644 = rw-r--r--

Introduction to Linux– packet installation
 yum
 search <packet>
 install < packet >
 remove < packet >
 update [< packet >]
 rpm
 -ivh < packet >
 -e < packet >
 -qa

Issabel basic settings
 Open in a web browser: https://ip-servidor (Issabel
IP Address)
 The digital certificate should be accepted the first
time.
 If it’s neccessary, stablish an exception on your
browser.

System operations (networks, users, updates, hardware, backup, preferences)
Calendar and address directory
Mail server and mail accounts settings
Fax services settings allowed by Issabel
Issabel switchboard services settings (settings, monitoring,etc)
Call reports, billing, logs, etc.
Jitsi Meet videoconference system and external applications download
External modules management
User extension settings
System security settings
Direct access to the last options we have used

 Network settings
 Issabel uses DHCP by default
 In most of the cases, these must be set:
Static IP
Gateway
DNS
 The first setting done in 95% of Issabel servers is network setting.

Once the extension is already set, we can set the IP phone or softphone with the data
created in the extension.
Recommendations:
 Using complex passwords
 Using security parameters such as allow / deny in the extension settings
 Using the password audit available in Issabel (Security → Weak keys)

TRUNK EXTENSION
PEE
R
USE
R
USE
R
PEE
R
FRIEND = USER +
PEER

 Announcement
 DISA
 IVR
 Extension
 Queue
 Terminate call
 ...

 Trunks
 Outgoing routes
 Incoming routes
 IVRs
 Queues
 Conferences
 Time conditions
 System recording
 Waiting music
 Ring groups
 Service classes
 ...

ADVANCED SETTINGS
MASSIVE EXTENSION SETTINGS
Display Name, User Extension, Direct DID, Outbound CID, Call Waiting,
Secret, Voicemail Status, Voicemail Password, VM Email Address, VM
Pager Email Address, VM Options, VM Email Attachment, VM Play CID,
VM Play Envelope, VM Delete Vmail, Context, Tech, Callgroup,
Pickupgroup, Disallow, Allow, Deny, Permit, Record Incoming External,
Record Outgoing External, Record Incoming Internal, Record Outgoing
Internal, Record On Demand, Record Priority

ADVANCED SETTINGS
Analog Extension Configuration

ADVANCED SETTINGS
Hardware Detection
 This action overwrites the following files:
o /etc/asterisk/chan_dahdi.conf
o /etc/dahdi/system.conf
o /asterisk/dahdi-channels.conf
 If a card is already installed and we want to detect a new card, it is recommended to make a backup of these files to
allow these previous configurations to be included in the new files.

ADVANCED SETTINGS
Hardware Detection

ADVANCED SETTINGS
Legacy Trunk Configuration

ADVANCED SETTINGS
Outbound Dialplan
Pattern Description
X Represents any digit from 0-9
Z Represents any digit from 1-9
N Represents any digit from 2-9
[1237-9] Represents any digit in brackets
. Represents one or more characters
| Separates the number to the left of the dialed number.
For example: 9 | NXXXXXX should represent
numbers marked as "92234567" but should only pass
"2234567"

ADVANCED SETTING
Service Classes

ADVANCED SETTINGS
Incoming Dialplan

ADVANCED SETTINGS
Conference Rooms
OPTION 1
OPTION 2

ADVANCED SETTINGS
Call queues

ADVANCED SETTINGS
Call queues
If more functionality is needed for the queuing
system, the Call Center community addon must be
used.

ADVANCED SETTINGS
IVRs

ADVANCED SETTINGS
Conditions and Time Groups

ADVANCED SETTINGS
Features Codes
Although there are many service codes registered in
Issabel, most of the time it is better to use the phone
own’s services.
The blacklist applies to incoming calls to the platform.

ADVANCED SETTINGS
Service Codes
Call listening
Echo testo for delay analysis
Call recovery from parking

ADVANCED SETTINGS
Call parking
The purpose of call parking is to park a
call to allow us to move around and
recover it later.

ADVANCED SETTINGS
Call recording
Incoming routes Outbound Routes Extensions
Queues Conferences

ADVANCED SETTINGS
Call recording

ADVANCED SETTINGS
Call registry
Generic Call Report
Real-time information about Issabel channels
Call cost settings
Cost per call information
Call distribution chart by time, number of calls…
Billing system configuration for Issabel
Logs of the asterisk console
Call distribution graphics by extensions, queues or trunks
Tabular summary of calls and times by extension
List of missed calls of the system

ADVANCED SETTINGS
Callback calls
PBX → PBX Configuration →
Callback
PBX → PBX Configuration → Inbound
routes

ADVANCED SETTINGS
DISA → Ringtone Access
DISA
routes

ADVANCED SETTINGS
Call identification improvement
PBX → PBX Configuration → Caller ID Lookup
sources
routes

ADVANCED SETTINGS
Distinctive ring
Then you will have to configure in the terminal.
Each brand may need a format.
Example Grandstream:
In Issabel
In terminal
<http://127.0.0.1>; info=ctu ctu

Security
TLS Setting
PBX → PBX Configuration → Asterisk SIP Settings
Extensions

Security
TLS / SRTP
 Signaling is optional but the media is not optional, either it is configured as RTP without encryption or SRTP with
encryption, but not both.
 This implies that audio cannot go directly between extensions and it should be consider that Asterisk currently
does not support ZRTP, only SRTP.SRTP(Secure Real time Protocol)
 ZRTP → Uses Diffie-Hellman keys exchange to generate a salt with which generate the SRTP

Security
IPTables

Security
IPTables
If we turn on the firewall in Issabel, we have to define the ports used by TLS and
WebRTC to allow us to register.

Security
Fail2Ban

Security
Others
Port Knocking services for ports openning.
Subscription to the Issabel network is necessary.
List of accesses the web platform.
Weak key analysis.
Admin password change, freepbx access, etc.
In order to install this type of certificate, we need the
server to have a valid FQDN.

Security
Others
 Authentication using two factors → Issabel Network subscription is required and allows
you to use the Google authenticator as a second level of security
 Realtime blackhole list → Add a packet filter on port 5060 DNS-based over an existing
list in rbl.issabel.guru

Security
WebRTC

Monitoring and recovery
Call monitoring

System monitoring

Monitorización y recuperación
System monitoring
PBX → PBX Configuration → Asterisk info(Sección
Advanced)
Security → Audit

System monitoring
Logs of the system→ /var/log
messages
secure
asterisk/
messages
full
issabelpbx.log
issabel/
audit.log
...

System Backups
Allows you to adjust backup from time to
time but not save or recordings or logs.
It allows you to delete backups after a
certain time to avoid disk filling.
It allows uploading backups from outside
to migrate from one computer to another.

Monitorización y recuperación
System Backups

System Backups

Extras
Error detection in protocol
1)Create the file /etc/yum.repos.d/irontec.repo and write the following
1)[irontec]
2)name=Irontec RPMs repository
3)baseurl=http://packages.irontec.com/centos/$releasever/$basearch/
2)Execute rpm –import http://packages.irontec.com/public.key
3)yum install sngrep
4)Execute the command sngrep

Extras
Error detection in protocol

Extras
FAX service
The fax system in Issabel is made up of 4 important components:
 Asterisk: IP Telephony.
 Iaxmodem: Fax-modem program that connects to asterisk through an IAX channel.
Creates a device (/ dev / ttyIAX), which will be used by Hylafax
 Hylafax: Program for sending and receiving fax.
 Framework NEO: Development scheme that includes libraries that implement Issabel.

Extras
FAX service

Extras
FAX service - iaxmodem
 It is an application that simulates a faxmodem using DSP (Digital Signal Processing)
libraries.
 This application can be used by any fax sending and receiving program.
 When iaxmodem is implemented, a file is created that will contain the data defined by the
virtual device and associate it with an asterisk extension.
 In Issabel that file is :
/etc/iaxmodem/iaxmodem-cfg.ttyIAX#

Extras
FAX service - hylafax
 It is a fax sending and receiving system.
 In essence, Hylafax consists of a server program called Faxgetty that is responsible for
monitoring ttyIAX devices and a fax dispatcher program called faxrcvd
 The Faxgetty server is always reading some special files called FIFO.ttyIAX # which is
where ttyIAX # devices receive modem commands.
 Issabel uses a file that allows the modems to be associated with Hylafax, it is file :
/var/spool/hylafax/etc/config.ttyIAX#

Extras
FAX service - hylafax

Extras
FAX service - Web

Openfire
yum install openfire
Extras

Extras
Issabel Customizations
 “Issabel is limited to what the web interface allows us.”
 To make changes in Issabel you must have high knowledge in asterisk.
 All the customizations we want to do can be done at custom files level:
 extensions_custom.conf, sip_custom.conf, iax_custom.conf, confbridge_custom.conf,
Fichero.conf
Fichero_override.conf
Fichero_additional.conf
Fichero_custom.conf

Extras
Connectivity with external DDBB
MySQL
Librería específica
/etc/odbcinst.ini
/etc/odbc.ini
postgreS
QL
Oracle
..
.
Linu
x
Asteris
k
res_odbc.conf
res_odbc_custom.conf
func_odbc.conf
extensions.conf

Extras
odbcinst.ini /etc/odbcinst.ini
[PostgreSQL]
Description=ODBC for PostgreSQL
Driver=/usr/lib/psqlodbcw.so
Setup=/usr/lib/libodbcpsqlS.so
Driver64=/usr/lib64/psqlodbcw.so
Setup64=/usr/lib64/libodbcpsqlS.so
FileUsage=1
[MySQL]
Description=ODBC for MySQL
Driver=/usr/lib/libmyodbc5.so
Setup=/usr/lib/libodbcmyS.so
Driver64=/usr/lib64/libmyodbc5.so
Setup64=/usr/lib64/libodbcmyS.so
FileUsage=1
odbcinst.ini
[asterisk]
driver=MySQL
server=localhost
database=asterisk
Port=3306
Socket=/var/lib/mysql/mysql.sock
option=3
charset=utf8
[centralita]
driver=MySQL
Server=192,168,5,20
database=centralita
Port=3306
charset=utf8
user=usuarioCentralita
password=LaSuperClave
/etc/odbc.ini

Extras
func_odbc.conf /var/www/html/admin/modules/core/etc/odbc/*.conf
[NOMBRE_CLIENTE]
dsn=centralita
readsql=SELECT NOMBRE FROM clientes WHERE telefono like '${SQL_ESC(${ARG1})}' OR movil like '${SQL_ESC(${ARG1})}'
prefix=CONSULTA
syntax=CALLERID(num)
synopsis=Extrae el nombre de la empresa del CALLERID(num)
[QUERY]
dsn=centralita
readsql=SELECT COUNT(*) from listanegra WHERE telefono like '${SQL_ESC(${ARG1})}' AND extension like '${SQL_ESC(${ARG1})}'
prefix=LISTANEGRA
synopsis=Consulta si está en la lista negra
[ADD]
dsn=centralita
writesql=INSERT into listanegra (telefono, extension) values ('${VAL1}','${VAL2}')
prefix=LISTANEGRA
synopsis=Inserta en la lista negra personal
[REMOVE]
dsn=centralita
writesql=DELETE from listanegra where telefono="${VAL1}" AND extension=,'${VAL2}'
prefix=LISTANEGRA
synopsis=Elimina un número de un usuario en la lista negra personal
res_odbc_additional.conf /etc/asterisk/
[asterisk]
enabled=>yes
dsn=>asterisk
pooling=>no
limit=>1
pre-connect=>yes
username=>asteriskuser
password=>avanzada7
res_odbc_custom.conf /etc/asterisk/
[centralita]
enabled=>yes
dsn=>centralita
pooling=>no
limit=>1
pre-connect=>yes
username=>usuarioCentralita
P assword=>LaSuperClave

Extras
extensions_custom.conf /etc/asterisk/
[from-internal-custom]
. . .
Include => servicios_propios
. . .
[servicios_propios]
exten=>_*60X., 1,NoOP(Añadir número a lista negra)
same=> n,Set(LISTANEGRA_ADD() = ${EXTEN:3},
${CALLERID(num)})
same=> n,Playback(Personalizados/alta_ok)
exten=>_*61X., 1,NoOP(Eliminar número de la lista negra)
same=> n,Set(LISTANEGRA_REMOVE() =
${EXTEN:3},${CALLERID(num)})
same=> n,Playback(Personalizados/borrado_ok)
[servicios_propios]
exten=>_XXX, 1,NoOP(Consulta previa de lista negra)
same=> n,Set(NUM =
${LISTANEGRA_QUERY(${CALLERID(num)},${EXTEN})})
same=> n,ExecIf($[${NUM} > 0]?Hangup())

Extras

Extras
Useful Commands
 Dialplan
 dialplan show [extension@][contexto]
 dialplan reload
 SIP protocol
 sip show peers
 sip show peer 601
 sip show settings
 Analog Lines (DAHDI)
 dahdi show channels
 dahdi show channel <numcanal>
 Voice mail
 voicemail show user for default

Extras
File Editing

Issabel Training Doc

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