For our needs, we have a similar functionality to proxy MSRP messages.
In our experience, some clients do not support IPv6 addresses, and if Kamailio received an MSRP message using an IPv6 address in the To header, then the forwarded message will be with IPv6 address From the header.
Such clients will not be able to parse MSRP messages.

Also if another server can parse IPv6 addresses but does not have connectivity to IPv6 and Kamailio send From with IPv6 address, then this server was not able to respond because does not have connectivity to IPv6 network. Some workaround is possible but in general, Kamailio as an MSRP proxy should use IP address of the outbound interface. Not the From header of the received MSRP message.

On another question.
How do you solve SDP message change?
We made this by writing the Kamailio route, but it is not simple for understanding and support.


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