Outbound calls failing after IOS upgrade

Unanswered Question


I recently upgraded my router to c2900-universalk9_npe-mz.SPA.151-2.T1.bin to support SRST 8.0. I upgraded so my 6921 phones would be supported in SRST. After upgrading I couldn't place any outbound calls, but I could receive calls. Using the CSIM start command from the router, I can dial any external number. Can anyone help here, according to prior IOS release notes, this issue should've been resolved.

Kind regards,

Sechaba Mokoena

I have this problem too.
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Christopher Graham Sat, 09/18/2010 - 19:54

What is you PSTN connection?  PRI? SIP?  This is a vital piece of information.

If you have a SIP trunk, you might be running into the new toll fraud prevention feature:


If that's the case, you just need to add the necessary IP addresses in the trust list.

If this is not the issue, you will need to provide some debugs.  Once you indicate what your call flow is, we can tell you what debugs are needed.

FYI...csim start is not the best way to troubleshoot call failure, as it does not process the entire call flow.


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