PSTN interconnection, and security interfaces for implementing a single-zone or multi-zone PacketCable solution for residential Internet Protocol (IP) voice services. PacketCable 2.0 Version 2.0 introduces IMS Release 7 IP Multimedia Subsystem into the core of the architecture. PacketCable uses a simplified IMS in some areas and enhances it in some cable-specific areas. PacketCable defined Delta specs related to the most important IMS specs from 3GPP. Deployment VoIP services based on the PacketCable architecture are being widely deployed by operators: B.net (Croatia) Cable One (System wide) Cabletica (Costa Rica) Cablevision – Optimum Voice (System wide) Charter (System wide) Claro TV (Guatemala, El Salvador, Nicaragua, Honduras) Cogeco - Cogeco Home Phone (Canada) Comcast - Comcast Digital Voice (System-wide) Cox – Cox Digital Telephone (System-wide) GCI (Alaska) Izzi Telecom (México) KabloNet (Turkey) Liberty Global (Puerto Rico) Net Serviços de Comunicação - NET Serviços de Comunicação (Brasil) NetUno (Venezuela) NOS (Portugal) ONO (Spain) Optus - SingTel Optus Pty Ltd (Australia) Rogers Telecom (Canada wide (Major cities and towns serviceable with rogers high-speed internet are eligible, still expanding, St John's, NL to Vancouver, BC, serviceable as of July 2007)) Shaw Communications (Canada: Calgary, Edmonton, Winnipeg and Victoria) Shentel (United States: Virginia, West Virginia, Maryland.) Telecentro Argentina (Argentina) TIGO (Honduras, El Salvador, Costa Rica) The United Group ("Serbia Broadband" - "Telemach Slovenia" - "Telemach Bosnia and Herzegovina) Unitymedia (UPC Germany) UPC Broadband (Across Europe) Vidéotron (Canada: Quebec) Virgin Media Ireland (Ireland) Ziggo (The Netherlands) References PacketCable 1.5 Specifications Audio/Video Codecs - PKT-SP-CODEC1.5-I01-050128 PacketCable 1.5 Specifications Network-Based Call Signaling Protocol - PKT-SP-NCS1.5-I01-050128 PSTN Gateway Call Signaling Protocol Specification - PKT-SP-TGCP1.5-I01-050128 Further reading Riddel, Jeff. (2007). PacketCable Implementation. Cisco Press. 1061 pages. . External links Digital cable Voice over IP