CUCM 11.5 Call Pickup issues

[nicolp_ar]

Hi, I'm having problems with Call pickup in a brand new set up:

+CUCM has a sip trunk against a Huawei SBC

+Cisco phones are configured in SIP.

A->PSTN->SBC->CUCM->B

When A calls comes from the outside and some member from the line group tries to pick up the call (B) the caller keeps it ringing and the line that picked up the call has a dead air until the call drops for both.

If someone calls from another extension, call pick up works fine.

Call traces pics are attached.

I've founded something strange in the call trace regarding the contact that shows some "sip:xxxxxstrangenumberxxxx@CUCM-IP", which is extracted from the UPDATE message sent from the CUCM to the SBC, and a part of it is below:

User-Agent: Cisco-CP8865/12.0.1
        Max-Forwards: 70
        Supported: timer,resource-priority,replaces
        Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
        CSeq: 101 UPDATE
        Session-ID: 62733c4f00105000a000002790816281;remote=c5deb4a39e22a61749aa7abfaab47357
        Call-Info: <urn:x-cisco-remotecc:callinfo>;x-cisco-video-traffic-class=DESKTOP;x-cisco-qos-tcl=true
        Supported: X-cisco-srtp-fallback
        Supported: Geolocation
        Min-SE:  1800
        Contact: <sip:b42b69e0-2ce7-b8d3-1928-bd4b10617df4@10.190.0.69:5060>;video;audio;+u.sip!devicename.ccm.cisco.com="SEP002790816281"
            Contact URI: sip:b42b69e0-2ce7-b8d3-1928-bd4b10617df4@10.190.0.69:5060
            Contact parameter: video
            Contact parameter: audio
            Contact parameter: +u.sip!devicename.ccm.cisco.com="SEP002790816281"\r\n
        Content-Length: 0

 When the SBC receives it answers with a 491 Request Pending ( I assume because it doesn't understand the hostname)

Help needed.

Thank you in advance.

[Franklin Gonzalez Sevillano]

Hi nicolp_ar,

I have the same problem whit a CUCM 11.5. We have sip trunk whit several ITSP and this only happens whit one of them. User started reporting it 2 days ago. Could you solve the problem?

Regards.

[nicolp_ar · Accepted solution]

Hi Franklin, yes we managed by creating a Sip Normalization Script and bind it in the Trunk Configuration in order to remove the contact id.

1. Device>Device Settings>Sip Normalization Script>Add New

     And paste the following script:

M = {}
     function M.inbound_INVITE(msg)
           msg:removeHeaderValue("Allow", "UPDATE")
    end
return M

Save it!

2. Device>Trunk and select the trunk with the problem

     Then go to the Normalization Script area and select the script created before.

Save it!

And that did the job.

[Franklin Gonzalez Sevillano]

It worked fine, thanks!