How to Implement China N1 CAS Signaling on IMG

Dialogic

Description:
CCITT-E1R2 CAS Baseline/Template variants are included in Dialogic IMG 1010 Integrated Media Gateway installation software package. 

China N1 signaling is a E1R2 variant used in the Chinese telecom network. 

This article describes a method to implement China N1 CAS signaling on the IMG.

Requirement:
The modifications to support additional call flows and changes to the line signaling bits as specified in the China N1 specification requires a customized PPL (Programmable Protocol Language) to be downloaded to IMG. 

The E1 AB line signalling bits are required for the China N1 variant. Both the C & D bits are required to be set to a 1. The Idle (ABCD bits 1011) and Out of Service (ABCD bits 1111) line signals are required to set as well.

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