UPDATE requests should be routed fine as requests within active dialogs.

This looks like some misconfiguration or a broken SIP entity somewhere, because the R-URI for UPDATE2 looks like a Route header URI, not a contact URI. That can happen because Kamailio considers the R-URI (after TOPOS processing) points to itself.

You need to get the pcap with the SIP traffic for the entire call, from initial INVITE to the UPDATE requests and email to sr-users@lists.kamailio.org to get assistance, because it does not seem to be about a C code issue. If I am wrong, then this item can be reopen.

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