Access@ Terminals@ Transmission and Multiplexing (ATTM); Integrated Broadband Cable and Television Networks; IPCablecom 1.5; Part 15: Analog Trunking for PBX Specification (V1.1.1)
Introduction and Purpose The present document defines extensions to the IPCablecom Network-based Call Signalling (NCS) [2] protocol to support the following analogue trunking for PBX interfaces on an embedded Voice-Over-IP client device in a IPCablecom environment: ? Ground-start lines. ? PBX one-way and two-way DTMF (dual-tone multi frequency tones) trunks. As shown in figure 1@ the IPCablecom NCS specification [2] already defines the Loop-Start line interface typically used for residential services today. The present document is designed for additional line/trunk interfaces to support analogue trunking for PBX so that the MTA (multimedia terminal adapter) may be used to interface directly to a Legacy PBX via a Ground-Start line or other trunk interface (EM - E and M Signalling or DID - Direct Inward Dialling). Example PBX trunk interfaces are shown below.