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Cisco Bug: CSCus32780 - Race condition w/media setup & tear down causes orphan streams on MTP

Last Modified

Jul 24, 2017

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases

9.1(2.11900.12)

Description (partial)

Symptom:
Dead Air calls when user goes off hook (receiving agent doesn't hear the end customer)

Orphan MTP streams which could cause calls to drop if there aren't enough MTP resources avaialble

Conditions:
MTP in the call flow for Early Offer.

Call flow: SIP phone1 ---- CUCM (DO) ---- CUCM(EO) ----- SIP phone2
Initial call setup in progress, SIP Ph2 forwards the call to another phone before call setup completely
Timing issue, back to back offer leading to one way audio or orphaned MTP resources.
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  • Status
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