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Cisco Bug: CSCvu83070 - CUCM sends ACK on ephemeral port in response to 491

Last Modified

Oct 12, 2020

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases

12.1

Description (partial)

Symptom:
Due to a race condition cucm receives sip 491 message. At this point cucm responds with ACK to an ephemeral port (instead of default port 5060)

Conditions:
Cucm and remote endpoint sends reInvite to each other at the same time. That triggers remote endpoint to send sip 491 message to cucm.
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