Can't make simultaneous calls

BiLLz0r's picture
Submitted by BiLLz0r on Wed, 05/13/2009 - 21:25

Hi all,

We have an odd issue with a clients system. They have an single BRI ISDN2 into the system and only 2 handsets. When 1 person is on a call the other can't make a new call. The user presses 0 (dial out code) and then the number and after a few seconds it just disconencts the call.
We haven't done any other ISDN setups from scratch as other installs have been FXO and VoIP outbound so I'm sure I'm missing something simple.
Ideas?

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ttrentler's picture

try a debug

by ttrentler - 05/13/2009 - 21:55

From the IOS command line try a debug isdn q931 and try a couple of test calls. That may shine some light on the issue.

BiLLz0r's picture

Thanks for that, that helped

by BiLLz0r - 05/19/2009 - 20:16

Thanks for that, that helped greatly.
As it turned out both BRI ports were in the default trunk group but we were only using 1 port so the 2nd call would try go over the 2nd port which wasn't in use. I removed the 2nd port from the trunk group and all was well.

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