I expect that the contact should be like:
Contact:
<sip:[email protected]:5060;alias=10.x.x.x~60911~2>;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel";video;+sip.instance="urn:gsma:imei:xxxxxxxx-366xxx-0"
Starting with +g.3gpp.icsi-ref, it should be header parameter, not uri -- the
uri is enclosed in between < >.
It might be that a node in the path is building the wrong Contact format.
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