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outdated if port/source-ip has changed through NAT since initial registration.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used in the reply might be wrong if the alias Bria added is outdated.
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