1. VoIP – Case Studies Duncan MacAuslan Task Coordinator - VoIP ITP Training 2006 14 September 2006

2. IP Layered Model Service Provider End user purchased applications, VSP * - theoretically there is no session layer in the IP model, split here for clarity. ADSL, Ethernet, WiFi TCP/UDP IP SIP/H.323, G7xx VoIPEmailHTTPToIPetc.Application ISP/CSP Carrier Session* Transport Internet Network Access LayerProtocols

3. Three carrier models PSTN PBX Router/GW IP WAN Soft-Switch Router IP WAN Application Servers PBX Traditional PSTN PSTN core replaced by packet switching Full end to end IP network – the NGN Where we are now! Transitionary mixture

4. VoIP Models Peer to peer Conventional Message Phone out from IP to PSTN Phone in from PSTN to IP – DID – Extension

5. Connecting a traditional phone to VoIP Phone/USB ‘dongle’ Broadband Wireless Internet ATAs ADSL or cable ATA – analogue telephone adaptor

6. IP handset connections Broadband Wireless Internet Connected to PC by sound card, USB or ethernet ADSL or Cable to Internet IP phones connected directly to local ethernet

7. Analogue Telephone Adaptor Internet Router PSTN PSTN used when no connection to internet VoIP pathway LAN

8. VoIP calls to users on same VSP network Internet Fred calls VoIP user Jill Routed across internet to VSP’s network VSP’s softswitch refers call to SIP server URI to find Jill’s current IP address. SIP server then drops out. Call is routed across VSP’s network to internet gateway closest to Jill

9. Outbound one-way VoIP service Internet PSTN If gateway in Australia caller usually has nominated a local call zone. If gateway overseas caller must dial full e.164 code eg +61 2 9555 1234 even if called party is next door. The gateway could be anywhere in the world depending on best tariffs. If gateway overseas, 000, if allowed, will arrive on international trunk CLI will be that of a line on gateway, if overseas eg +1 123 555 555, not necessarily identifying caller. SIP used to map caller’s IP address and URI to gateway phone number

10. Inbound PSTN to VoIP – DID model Internet PSTN VoIP user is allocated PSTN number eg 02 95551234 Calling party dials VoIP user using PSTN number; routed across PSTN to VSP’s incoming gateway VSP’s softswitch refers call to SIP server to map PSTN to URI and current IP address. SIP server drops out. Call is routed across gateway to internet

11. Inbound PSTN to VoIP – extension model Internet PSTN VoIP user allocated a extension eg 09137637 Caller dials VSP’s gateway using PSTN number 9555 1234 Routed across PSTN to VSP’s incoming gateway. When call established caller dials ‘extension’ 52341 using DTMF VSP’s softswitch refers call to SIP server to map extension to URI and current IP address. SIP server drops out. Call is routed across gateway to internet

12. VoIP to VoIP PSTN VSP1 VSP2 Internet Red line where VSP1 user must use PSTN to call VSP2 user Phone outPhone in eg Skype Green line shows how a Skype user calls a VSP2 user Purple shows how peering will avoid the PSTN – the NGN solution

13. Some IP telephony examples Operator 1 targeted at any broadband customer nationally launched early 2005 new broadband churn processes, power supply notice to users, number allocation

14. Operator 2 Wireless broadband voice Sydney and Melbourne metro coverage Assessed numbering options, expected geographic but longer term will explore mobility capability, radio links should create greater customer awareness of power issue Endorsed third party VoIP provider over own network

15. Operator 3 Existing experience with customers and billing in cellular market Mass market (retail outlets and advertising) via any broadband link includes CE (process B) FAQs include a number of quality and performance warnings, numbers via 3 rd party ISDN aspiring to CCS7

16. Operator 4 Triple play over cable with voice broadband and Pay TV Regional Victorian focus Agreed CE and customer advice warnings re – power, – temporary exemption from portability because of interface, – highly localised pricing attraction