VoIP Case Studies. Duncan MacAuslan Task Coordinator - VoIP. ITP Training October 2007
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1 VoIP Case Studies Duncan MacAuslan Task Coordinator - VoIP ITP Training October 2007
2 IP Layered Model Layer Protocols Service Provider Application Session* VoIP HTTP ToIP etc. SIP/H.323, G7xx End user purchased applications, VSP Transport TCP/UDP IP ISP/CSP Network Access ADSL, Ethernet, WiFi * - theoretically there is no session layer in the IP model, split here for clarity. Carrier
3 Three carrier models PBX PSTN PBX Traditional PSTN PBX Where we are now! Transitionary mixture PBX Router/GW PSTN core replaced by packet switching Soft-Switch IP WAN Router/GW Soft-Switch Router Application Servers Full end to end IP network the NGN IP WAN Router
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 ADSL or cable V ATAs Broadband Wireless V ATA analogue telephone adaptor
6 IP handset connections Connected to PC by sound card, USB or ethernet ADSL or Cable to IP phones connected directly to local ethernet Broadband Wireless
7 Analogue Telephone Adaptor V PSTN used when no connection to internet PSTN LAN Router VoIP pathway
8 VoIP calls to users on same VSP network Fred calls VoIP user Jill Routed across internet to VSP s network Call is routed across VSP s network to internet gateway closest to Jill VSP s softswitch refers call to SIP server URI to find Jill s current IP address. SIP server then drops out.
9 Outbound one-way VoIP service SIP used to map caller s IP address and URI to gateway phone number PSTN If gateway in Australia caller usually has nominated a local call zone. If gateway overseas caller must dial full e.164 code eg 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 , not necessarily identifying caller.
10 Inbound PSTN to VoIP DID model PSTN Calling party dials VoIP user using PSTN number; routed across PSTN to VSP s incoming gateway VoIP user is allocated PSTN number eg 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 PSTN Caller dials VSP s gateway using PSTN number Routed across PSTN to VSP s incoming gateway. When call established caller dials extension using DTMF VSP s softswitch refers call to SIP server to map extension to URI and current IP address. SIP server drops out. VoIP user allocated a extension eg Call is routed across gateway to internet
12 VoIP to VoIP eg Skype VSP1 VSP2 Phone out Phone in PSTN Red line where VSP1 user must use PSTN to call VSP2 user Green line shows how a Skype user calls a VSP2 user Purple shows how peering will avoid the PSTN the NGN solution
13 Engin launched late 2004 targeted at residential and SME about 60,000 customers Free on net calls Some plans give free local and national calls ES calls work but some limitations power supply notice to users holds carrier licence Invested in wireless ISP Channel 7 invested in Engin
14 Broadband Anywhere Wireless broadband ISP in regional Sth Aust Offers VoIP to its customers Extended features No mention of CSG, Emergency Services etc
15 ISPhone Wholesaler; no direct services Resellers target Business and SMEs Residential product available Offers full VoIP networks including ADSL2+
16 Neighbourhood Cable Formed 1994 HFC in three regional Victorian towns Triple play over cable with voice, and TV VoIP Free calls on network Cheap national calls Agreed CE and customer advice warnings re power, emergency calls need location temporary exemption from portability because of interface,
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