Outbound calls dropping with cause code 127

[mohammed asif suleman]

hi,

we have cucm8.6 and gateway 2811 with ios12.4T

everything was working fine till last week then users started complaining about call drops to certain numbers.

when i checked on gateway i got q.850 cause 127 error in debug ccsip messages.

i called ITSP and those guys told me there is no early offer in SDP.

i configured the early offer support for voice and video calls(insert MTP if needed) but still i am not able to call those numbers.

and ITSP saying they are not receiving early offer.

i tried to force that on gateway but the command is not available in voice service voip or dial-peer.

please can anyone help me

[Shadi Shami]

Hello,

Can you please  provide the output of "debug ccsip messages" together with the "show run"?

Thank you,

Shadi

[ashok_boin]

Hi,

I think there are 2 options.

1. Manually set the codec on GW dial-peer what PSTN provides expects

2. Upgrade to right IOS which consists of "early-offer forced" command

The following links may help...

https://supportforums.cisco.com/discussion/11527131/sip-trunk-early-offer

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube_sip/configuration/xe-3s/cube-sip-xe-3s-book/do-to-eo.html

Please provide SIP traces if it fails. Hope you have SIP trunk configuration from CUCM to PSTN provider.

Regards..

Ashok.

[Nadeem Ahmed]

Generally ITSP has nothing to do with EO OR DO. It has to be proper messages with SDP either on EO or DO to make that call work.

as per 127 cause code this is the probable issue.

The following error codes are generated when the call is released by the SIP interface:

•127 - Interworking, unspecified

–Acknowledgment not received on final or reliable provisional response to a SIP 'Invite' or 'Re-Invite' sent.

–When the Session Description Protocol (SDP) is not received in a SIP 'Ack' request and is expected.

–When 200 class response to an initial 'Invite' is sent or received and SDP is expected but not available.

Secondly do you see in the ccsip message on 2811 router  do INVITE has SDP ? Please post the debug ccsip message and ccapi inout debug for one unsuccessfull call.

Br,

Nadeem

[mohammed asif suleman]

Thank you for the replies,

i was not able to test as my working hours were over,

attaching the debugs..

i cannot see the SDP in the invite ,i don't know why?

i have early-media disabled 180 in sip-ua on gateway, if i remove that there will be no ring back tone for all calls.

[ashok_boin]

As per the attached files, it looks like Delayed offer as the SDP sent after "200/Trying".

If possible, can we have a diagram and give the details to understand the issue better?

Have you tried the options provided above for Early offer?

Regards...

Ashok.

[mohammed asif suleman]

Thank you for the replies,

the issue got resolved with the help of TAC.

actually we have h.323 and sip gateway configured on CUCM and the outbound calls were using H.323 as it was pointed to cube in RL,RG.

now we changed it to sip trunk and the calls with sdp  are successful.

[Humberto Barrios]

Hi, how you configure the sdp on invite on sip trunk?