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Cisco Bug: CSCuq22701 - T-38 fails when CM sends multiple re-Invites to fax server

Last Modified

Jun 10, 2020

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases

10.5(1.10000.7) 10.5(2.10000.5) 11.0(0.98000.299)

Description (partial)

SIP to SIP fax call with MTP fails. Re-invite after switch over to T.38 is sent from the CM using a CM IP address and fake port and SDP mode being set as sendrecv.

Fax is initiated by the fax server, after the call switches to fax CM sends an initial re-Invite to the other fax server to make sure it supports fax using CM's IP address and a fake port with SDP mode set to sendrecv. This causes the fax server to try to establish the connection using the fake port and to ignore the second re-Invite with the actual port.

Related Community Discussions

Upgrade CUCM,UCCX and CUC most solid version 10.5 or 10.6?
We are looking to upgrade our version of CUCM, UCCX and CUC from 8.6.  Which version is more solid without having any issues 10.5 or 10.6 (Needing to know any gotchas)? Any help will be greatly appreciated.   Thanks,   Don Fitzgerald
Latest activity: May 21, 2015
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