I don't think is related to Record-Route, maybe to the presence of Contact in the ACK
(usually is not).
Anyhow, the xavp seems to be required every time a Contact has to be generated when
contact_mode = 2 -- that looks like what code requires. I replaced the use of avps with
xavps, but my patch doesn't seem to affect what was in the initial implementation done
by @henningw - maybe he can comment more and say if it's expected behaviour and a PR
needs to be done to cover your case.
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