Welcome

IP Telephony VOIP

What is VOIP 1st Voice App 1995 VocalTec Voice packets transported over IP network instead of PSTN Uses call connection standards such as H.323, SIP, MGCP Uses well known Media standards such as G.711, G.728, GSM, etc Cisco uses SKINNY, but changes in v5.x Access to PSTN via gateways VOIP will become the default, already out sells traditional PBX Reported to be the Broadband Killer App Parks Associates UK forms trade body Internet Telephony Service Providers Association ITSPA We will all be users

BT 21CN The BT 21st Century network Started 2004 –bypass core PSTN service for Cambridge & Woolwich £10 Billion spend over next 5 years 50% customers moved by 2008 1500 customers to trial fibre to the home Projected savings of £1 Billion per year by adopting single infrastructure

Service Providers Babble BT Call1886 FreeWorldDialup PipeMedia SIPGate Vonage Gossiptel VoipGate FreeSpeech.co.uk ……………….and many more

Phones Softphones Xten Snom KPhone Windows Messenger Ineen SJ-Labs LinPhone Gizmo HardPhones 3COM DLink Cisco Grandstream Avaya Siemens ATA’s Mobile Phones Motorola & SIPCPE GSM + 802.11 abg ………………………………….plus many many more

Current Trial 2Mb/s PCM link to the BTEX PBX Call Signalling conversion DPNSS to QSIG Link to Cisco CallManager CallManager connection to main Call Billing data collection service Extension numbers 15XX allocated

Current Trial

Advantages Lower call costs Lower Network Leasing costs Integrated Voice and Data Applications Single Communications Management Domain Moves, Adds, Changes Flexibility Hot-desking Remote Workers Voicemail Text to Speech MoH

Issues Layer 1 needs to meet ‘real-time’ requirements Loss, Jitter & Delay QoS present from end-to-end New management techniques for converged network Queuing at egress points Power Emergency Services Cost of Handsets Security

Security Eavesdropping Identity Theft DOS SPIT/SPAM VOMIT Phishing Theft of Service Manipulation of CDR Compliance with Law & Policy

Security The bottom line VOIP doesn’t make your network less secure It needs protected like any other network application.

So concerns with security for the phone network is something new then?

The S word Skype

The problem with Skype P2P technology Proprietary Can act as an agent even when you not using it Payload encrypted A true P2P system, in our opinion, is one where all nodes in a network join together dynamically to participate in traffic routing-, processing- and bandwidth intensive tasks that would otherwise be handled by central servers Skype FAQ Client License

Skype Article 4 Utilization of Your computer 4.1 Utilization of Your computer. You hereby acknowledge that the Skype Software may utilize the processor and bandwidth of the computer (or other applicable device) You are utilizing, for the limited purpose of facilitating the communication between Skype Software users. 4.2 Protection of Your computer (resources). You understand that the Skype Software will use its commercially reasonable efforts to protect the privacy and integrity of the computer resources (or other applicable device) You are utilizing and of Your communication, however, You acknowledge and agree that Skype cannot give any warranties in this respect.

Skype Breaks Connection Policy – no P2P apps Breaks ICT software policy – standards based Can break JANET AUP wasting staff effort or network resources using JANET in a way that denies service to other users see UKERNA VAG document March 2006

Future Some DPNSS signalling issues to solve Bring SIP Proxy into service Rollout DNS SRV records Add DD extensions Move to CM ver 5 Use phones for real Develop STUN server Follow developments for convergence of Voice, Video and IM services

In Tomorrows World style The Live Demo

Questions Steven Jack Computing Service Multimedia Communications Unit X3828 s.jack@compserv.gla.ac.uk