ATA is dropping calls randomly

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May 23rd, 2008
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Since we upgraded CallManagers to 4.2(3)SR3a, our ATAs don't hold calls. Sometimed 2 minutes, sometimes 30 minutes, but the call WILL get dropped with a 'Temp Fail' message on the Desk Phone and a CDR disconnect code of 41 (Temporary Failure).

No routers involved, just ATA/Pots phone to 7940 Desk phone on same subnet (or not, it doesn't matter).

Any ideas? Anyone else experience this?

I think this may be something TAC needs to know about.

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a-vazquez Thu, 05/29/2008 - 10:36
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5 ms problem delay from GW is may be the root cause of the issue. please do print-call to see if you run into Hang call situation .

c.yeo Thu, 05/29/2008 - 12:59
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actually, Cisco created some CallManager traces the other day. Although I couldn't see anything in them, TAC has suggested it may be the second Phone port trying to register with the CallManager.

We logged into the ATA (with IE) and changed the SCCP Parameter: SID1 to a 0 (instead of a period). The box has had no problems since.

I have change the other ATAs and will check them out tomorrow.

Strange things....

d.haeni Thu, 03/12/2009 - 07:53
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Do you have proof in the meantime that this was the cause of your call drops? Same strange things happen here as well




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