CFA and ISDN channel usage

Unanswered Question
Jul 7th, 2008


If an external caller was redirected (CFA) at another external user, how many ISDN channels are needed?

And what happen if voice gateway uses MGCP and CM went down? Assuming no SRST as well.


I have this problem too.
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Jaime Valencia Mon, 07/07/2008 - 09:08

2 channels, one for the incoming call and one for the outgoing call

call should stay up because of call preservation, SRST is used for phones after failover and to make new calls so it's really out of the picture at that point.



if this helps, please rate


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