I've an issue using a 3845 router as a voice gateway.
Internal voip calls are placed through a call manager 6 and external calls go through an E1 PRI interface.
Users claim that after ten seconds of two-way audio conversation the call is automatically dropped. After some debug I discovered the router is sending the ISDN DISCONNECT message after 10secs not the PSTN.
I attached a show run and a debug isqnd q931 of a dropped call. Calling numìber is 00000 called is 46299.
Llet me know if you need more shows or debug.
thanks and regards
Modified by lorenz84gDD
The issue is mainly on incoming calls from the pstn. And I get the release cause:
*Feb 16 11:02:52.342: ISDN Se0/0/0:15 Q931: TX -> DISCONNECT pd = 8 callref = 0x9DBB
Cause i = 0x80AF - Resource unavailable, unspecified
I have same issue with E1 in a 2951 (IOS 15.0), ramdomly calling to same PSTN numbers they works ok, sometimes we receiving RESOURCE UNAVAILABLE, al 10 second we receive fast busy signal....we tried everything..but nothing works...
What do the CUCM traces say? You can also enable cch323 debugging on the gateway to see if CUCM is sending the disco first. In my experience esource unavailable usually indicates a DSP, MTP, Xcoder issues that I have seen. Fast Start enabled?