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Malformed Missing URL Yealink to CUCM 10

I have a problem to make a transfer using a phone yealink T48G with CUCM 10.5. I attahed the logs capture on phone T48G. I obtained a Bad Request 400 Malformed/Missing URL.

 

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christoph.hable
Beginner

Hi,
the user part is missing in an Invite message before the Refer which probably leads to this 400 message from UCM with following Cause Description: "Cause: Invalid information element contents (100)".

INVITE sip:192.168.217.236;user=phone SIP/2.0
To: <sip:192.168.217.236;user=phone>

It should be in the following syntax afaik:

To:<sip:userpart@destIP>;tag=to-tag
INVITE sip:userpart@destIP:destPort SIP/2.0

Did you also contact Yealink support?

BR,
Chris
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