- Less programming of trunk groups in the CO to manipulate overflow whether it be in or out. That is, if 1 trk group is busy there will be no need for overflow to the other trunk group. If it is one trunk group all the channels will hunt to next channel if they are in use whether it is inbound or outbound. Traditionally, incoming starts from trk member 1, outbound starts from trk member 46.
- You will also get a backup d-channel that wil be available if the primary has a problem. If for some reason another span is needed, depending if the Asterisk is capable of doing this, it can be set-up as a full T1 rather than a PRI. This will get you an additional b-channel for voice and the full T1 can be a rider AND use the the d-channel signaling form the other spans.
Q: How can we achieve that in asterisk?
Ans: NFAS (Non-Facilities Associated Signaling) is an ISDN feature for sharing one ISDN D channel accross multiple ISDN PRI lines.
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