I'm getting the following output for incoming calls;
un 3 10:41:28.576 DST: ISDN Se0/0/0:23 Q931: RX <- SETUP pd = 8 callref = 0x0B5B Bearer Capability i = 0x8090A2 Standard = CCITT Transfer Capability = Speech Transfer Mode = Circuit Transfer Rate = 64 kbit/s Channel ID i = 0xA98383 Exclusive, Channel 3 Display i = 0xB1, 'KTSC' Calling Party Number i = 0x2081, '9222222222' Plan:Unknown, Type:National Called Party Number i = 0xA1, '9222222222' Plan:ISDN, Type:National Jun 3 10:41:28.584 DST: ISDN Se0/0/0:23 Q931: TX -> RELEASE_COMP pd = 8 callref = 0x8B5B Cause i = 0x80A9 - Temporary failure Jun 3 10:41:28.584 DST: ISDN Se0/0/0:23 Q931: TX -> SERVICE pd = 3 callref = 0x0000 Change Status i = 0xC2 - out-of-service Channel ID i = 0xA98383 Exclusive, Channel 3 Jun 3 10:41:28.622 DST: ISDN Se0/0/0:23 Q931: RX <- SERVICE ACKNOWLEDGE pd = 3 callref = 0x8000 Change Status i = 0xC2 - out-of-service Channel ID i = 0xA98383 Exclusive, Channel 3
We hear busy signal when calling in. Not sure what "Change Status i = 0xC2 - out-of-service " , I engaged telco and they said it is something on our end, and the channels are busy. They are not releasing. I tried reseting the controller, restart MGCP from CUCM and GW. Resetting the DSP. Issue gets resolved for a while then comes back.
I don't see any channels being busy out through "show isdn services" command.
If anyone has any troubleshooting steps or has encountered this issue before, please share.
Hi Manish, +5 to you for pointing out to exact issue & solution for that. I am curious to know that how did you recognize the cause and why that command causing issue and why it has resolved after removing it. Can you please brief it little bit for me.
Voice, Cisco Fax Relay and Fax Passthrough type of calls will fail when mgcp fax t38 inhibit command is configured
This problem is noticed on Unified CM 6.0(1) and above.
When you disable T.38 fax relay, you also need to disable the default enabled fxr-package, in addition to mgcp fax t38 inhibit, and reset the mgcp service. Otherwise, you enable T.38 fax relay with default enabled fxr-package.
Further Problem Description: Unified CM began to support T38 fax relay (CallAgent-controlled mode) based on if fxr-package is enabled since 4.2 in Windows release and 6.0 in Linux release.
The current design states if GW and Call Agent (CUCM) fail on the fax protocol negotiation, all types of calls will be rejected including voice
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