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Cisco Bug: CSCtd99230 - CUCM replies with wrong SCCP ORC ACK to H245 OLC

Last Modified

Feb 28, 2018

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases

6.1 7.1 8.0 8.5(0)

Description (partial)

Symptom:
One way voice, IP phone is not hearing the remote party

Conditions:
H323 --- CUCM -- SCCP

This issue occurs when following call signaling is seen

H323---->CM                      OLC-1
CM ----->phone                ORC-1
H323---->CM                      CLC-1
CM ----->phone                CRC-1
H323---->CM                      OLC-2
CM ----->phone                ORC-2
H323<----CM                      CLC-1-ack
CM< -----phone                ORC-1-ack
H323<----CM                      OLC-2-ack
CM< -----phone                ORC-2-ack

For OLC-2-ack CUCM takes the media parameters (IP address / UDP port) from ORC-1-ack 
while it should take the one from ORC-2-ACK
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Bug Details Include

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  • Status
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