[sr-dev] [kamailio/kamailio] set_contact_alias() issue with clients adding it to their Contact (#2308)

[mtryfoss]

I'm using set_contact_alias() to fix nat registrations, in this case with a Bria client.
Somehow Bria learns that I'm using this - probably through the Contact in the 200 OK reply of save(). Bria then adds this to the Contact when replying to incoming INVITE.

After some time, something happens in the network at client side and the connection gets a new port through the router. Bria does not notice and still sends the old alias-parameter with the port not used anymore. When I'm calling handle_ruri_alias(), Kamailio reads this instead of the actual port and the ACK to 200 OK is sent to a port not used anymore.

This can probably be solved by either, in preferred order:
- rewrite set_contact_alias() and add_contact_alias() to replace existing alias parameters 
- regexp remove of alias parameter from Contact of all messages coming from clients
- regexp remove of alias parameter from Contact returned by save()

Br,
Morten

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