VoIP Technology Developments [email_address] Co-leaders: José A. Domínguez (University of  Oregon) [email_address]   http:...
Several Uses for VoIP <ul><li>Voice Trunk Replacement </li></ul><ul><li>End-user Appliances </li></ul><ul><li>Computer Tel...
Elements of the Current Technology <ul><li>Switching Devices (unPBX/IP PBX) </li></ul><ul><li>End-user Devices (IP Telepho...
VoIP Technology (CODECs) <ul><li>G.711 (PCM) – 64Kbps (4.4 MOS) </li></ul><ul><li>G.721, G.723, G.726 (ADPCM) – 16, 24, 32...
VoIP Technology (Delays) <ul><li>Fixed Delay Components: </li></ul><ul><ul><li>Propagation Delay </li></ul></ul><ul><ul><l...
VoIP Technology (Call Setup) <ul><li>H.323 Standard (Video conferencing over Packet/Data Networks) </li></ul><ul><ul><li>H...
VoIP Technology (QoS) <ul><li>Dejitter Buffer </li></ul><ul><li>Type of Service (TOS) </li></ul><ul><li>Weighted Fair Queu...
Concerns To Be Addressed <ul><li>Powering for End-user Devices </li></ul><ul><li>Reliability </li></ul><ul><li>Troubleshoo...
What has changed? <ul><li>IP Telephones powered by proprietary switching devices </li></ul><ul><li>Converters for Current ...
Things that we are still missing <ul><li>Device location. Similar to cell phone triangulation. How about GPS? </li></ul><u...
UO VoIP Services <ul><li>Equipment: </li></ul><ul><ul><li>Redundant IP/PBX Call Manager </li></ul></ul><ul><ul><li>Cisco D...
 
 
 
Tracking Technology Changes <ul><li>Mailing Lists </li></ul><ul><ul><li>IETF’s IP Telephony WG ( [email_address] ) </li></...
Tracking Technology Changes <ul><li>Websites </li></ul><ul><ul><li>Internet Technical Resources ( http://www.cs.columbia.e...
Tracking Technology Changes <ul><li>Hardware Manufacturers </li></ul><ul><ul><li>Cisco Systems ( http://www.cisco.com ) </...
Books in the market <ul><li>IP Telephony (Bill Douskalis) </li></ul><ul><li>Voice over IP (???) </li></ul><ul><li>Voice ov...
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VoIP Technology Developments Net@EDU

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  • PCM – Pulse Code Modulation ADPCM – Adaptive Differential PCM LD-CELP – Low-delay Code Excited Linear Predictors CS-ACELP – Conjugate-Structure Algebraic CELP
  • VoIP Technology Developments Net@EDU

    1. 1. VoIP Technology Developments [email_address] Co-leaders: José A. Domínguez (University of Oregon) [email_address] http://ns.uoregon.edu/~jad/Net@EDU/
    2. 2. Several Uses for VoIP <ul><li>Voice Trunk Replacement </li></ul><ul><li>End-user Appliances </li></ul><ul><li>Computer Telephony & VoIP </li></ul>
    3. 3. Elements of the Current Technology <ul><li>Switching Devices (unPBX/IP PBX) </li></ul><ul><li>End-user Devices (IP Telephones, Ethernet Telephones, Computer Telephony Apps, Regular Analog/Digital Telephones) </li></ul><ul><li>Access Gateways (Analog/Digital) </li></ul><ul><li>Wireless VoIP </li></ul>
    4. 4. VoIP Technology (CODECs) <ul><li>G.711 (PCM) – 64Kbps (4.4 MOS) </li></ul><ul><li>G.721, G.723, G.726 (ADPCM) – 16, 24, 32, 40 Kbps (4.2 MOS) </li></ul><ul><li>G.728 (LD-CELP) – 16 Kbps (4.2 MOS) </li></ul><ul><li>G.729, G.729a (CS-ACELP) – 8Kbps (4.2 MOS) </li></ul><ul><li>G.723.1 (CS-ACELP) – 5.3Kbps (3.5 MOS), 6.3Kbps (3.98 MOS) </li></ul>
    5. 5. VoIP Technology (Delays) <ul><li>Fixed Delay Components: </li></ul><ul><ul><li>Propagation Delay </li></ul></ul><ul><ul><li>Serialization Delay </li></ul></ul><ul><ul><li>Processing Delay </li></ul></ul><ul><li>Variable Delays: </li></ul><ul><ul><li>Queuing Delay </li></ul></ul>
    6. 6. VoIP Technology (Call Setup) <ul><li>H.323 Standard (Video conferencing over Packet/Data Networks) </li></ul><ul><ul><li>H.225 </li></ul></ul><ul><ul><li>H.245 </li></ul></ul><ul><li>Real-Time Transport Protocol (RTP)/Real-Time Transport Control Protocol (RTCP) </li></ul><ul><li>Session Initiation Protocol (SIP) </li></ul><ul><li>Multimedia Gateway Control Protocol (MGCP) </li></ul>
    7. 7. VoIP Technology (QoS) <ul><li>Dejitter Buffer </li></ul><ul><li>Type of Service (TOS) </li></ul><ul><li>Weighted Fair Queuing (WFQ) </li></ul><ul><li>Random Early Detection (RED) </li></ul><ul><li>Weighted RED (WRED) </li></ul><ul><li>Multilink PPP (MLPPP) </li></ul><ul><li>Resource Reservation Protocol (RSVP) </li></ul>
    8. 8. Concerns To Be Addressed <ul><li>Powering for End-user Devices </li></ul><ul><li>Reliability </li></ul><ul><li>Troubleshooting VoIP Services </li></ul><ul><li>Access to Emergency Services and related issues (Liability) </li></ul>
    9. 9. What has changed? <ul><li>IP Telephones powered by proprietary switching devices </li></ul><ul><li>Converters for Current devices </li></ul><ul><li>Some more layers of reliability have been added </li></ul><ul><li>New services added to IP PBXs and gateways </li></ul>
    10. 10. Things that we are still missing <ul><li>Device location. Similar to cell phone triangulation. How about GPS? </li></ul><ul><li>Standardization for power provisioning </li></ul><ul><li>Plan for an open environment similar to the current data and voice networks </li></ul><ul><li>Management platforms </li></ul>
    11. 11. UO VoIP Services <ul><li>Equipment: </li></ul><ul><ul><li>Redundant IP/PBX Call Manager </li></ul></ul><ul><ul><li>Cisco Digital/Analog Gateways </li></ul></ul><ul><ul><li>Cisco’s IP Telephones </li></ul></ul><ul><li>Services Offered: </li></ul><ul><ul><li>VoIP Trunks to Remote Sites </li></ul></ul><ul><ul><li>On Campus Mobility via IP Telephones </li></ul></ul>
    12. 15. Tracking Technology Changes <ul><li>Mailing Lists </li></ul><ul><ul><li>IETF’s IP Telephony WG ( [email_address] ) </li></ul></ul><ul><ul><li>IETF’s PSTN & Internet Internetworking WG ( [email_address] ) </li></ul></ul><ul><ul><li>IETF’s Media Gateway Control WG ( [email_address] ) </li></ul></ul><ul><ul><li>Session Initiation Protocol WG ( [email_address] ) </li></ul></ul><ul><ul><li>Other IETF WGs (SPIRITS, ENUM, RSVP, DIFFSERV, AVT, INTSERV) </li></ul></ul><ul><ul><li>Computer Telephony Newsletter ( [email_address] ) </li></ul></ul>
    13. 16. Tracking Technology Changes <ul><li>Websites </li></ul><ul><ul><li>Internet Technical Resources ( http://www.cs.columbia.edu/~hgs/internet ) </li></ul></ul><ul><ul><li>Hello Direct ( http://www.phonezone.com ) </li></ul></ul><ul><ul><li>Internet Telephony ( http://www.fokus.gmd.de/research/cc/glone/projects/ipt ) </li></ul></ul><ul><ul><li>Computer Telephony ( http://www.telecomlibrary.com ) </li></ul></ul><ul><ul><li>European Telecommunications Standards Institute ( http://www.etsi.org/tiphon ) </li></ul></ul><ul><ul><li>Internet & Telecomms Convergence Consortium ( http://itel.mit.edu ) </li></ul></ul>
    14. 17. Tracking Technology Changes <ul><li>Hardware Manufacturers </li></ul><ul><ul><li>Cisco Systems ( http://www.cisco.com ) </li></ul></ul><ul><ul><li>Lucent Technologies ( http://www.lucent.com ) </li></ul></ul><ul><ul><li>3Com ( http://www.3com.com ) </li></ul></ul><ul><ul><li>Nortel Networks ( http://www.nortelnetworks.com ) </li></ul></ul><ul><ul><li>Vocaltec ( http://www.vocaltec.com ) </li></ul></ul><ul><ul><li>RadVision ( http://www.radvision.com ) </li></ul></ul>
    15. 18. Books in the market <ul><li>IP Telephony (Bill Douskalis) </li></ul><ul><li>Voice over IP (???) </li></ul><ul><li>Voice over Data Networks (???) </li></ul>

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