Cisco Bug: CSCsy82117 - CUBE: SIP to H323 doesn't complete T.38 negotiation w/o inbound OLC
Apr 06, 2017
- Cisco IOS
Known Affected Releases
Symptom: CUBE fails to send an OLC to initiate T.38 when operating in a SIP --> H323 call flow. Specifically, on an inbound SIP call, the H.323 will start T.38 negotiation. A H245 requestMode will be received and CUBE will respond with requestModeAck. The logical channels will be closed in both directions with CloseLogicalChannel and CloseLogicalChannelAck messages. However, CUBE will not originate an OLC for T.38 operation until the far end H.323 sends one first. Conditions: This was seen specifically in this call flow: Fax-A---SIP---PSTN---SIP---CUBE---H323---CUCM---SIP---ATA---Fax-B Call is from Fax-A to Fax-B.
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Bug Details Include
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