handle_ruri_alias() only handle alias in Request-URI, not the Contact returned
by the registrar for REGISTER.
For most phone clients this is not a problem but Bria used that info in
subsequent requests.
So, when the proxy again doing set_contact_alias() on an INVITE from Bria
(already containing an alias), you'll end up with two alias parameters. One of
them might be outdated if port/source-ip has changed through NAT since initial
registration.
When proxy then calls handle_ruri_alias() the first parameter is handled and
removed, and you'll send the one which the proxy actually added back to the
client. The ip/port used in the reply might be wrong if the alias Bria added is
outdated.
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