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Cisco Bug: CSCtf02177 - IME Fallbacks fail under load, issue with allocating unique dtmf key

Last Modified

Nov 03, 2012

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases

8.0 8.0(2)

Description (partial)

Symptom:

In an IME configuration where PSTN Fallback capability is enabled; a subset of IME calls may cease to properly fallback to PSTN, even when voice-quality issues are detected by the system.  This will result in call remaining on the IME network, with the subscriber continuing to experience and perceive voice-quality issues.

Internally, the following will be observed on the terminating UCM of the IME call:

In the detailed SDI, multiple instances of:
PstnFallBackD::wait_PstnFallBackInd- Can not allocate a UniqueDtmfKey for this call E164Dn %s for profile %s

In RTMT, occurrences of this alarm:
"Insufficient PSTN Fallback Identifiers"


Conditions:

Issue is triggered by making IME calls (even at relatively low call volume (10-20 active calls))
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