Due to some ambiguity of the RFCs some existing UAs include the "user=phone"
parameter in requests that have SIP URIs, which do not conform to phone number
format requirements (or don't have a phone number in the user part at all).
Currently, this causes SailFin to fail when sending subsequent requests (e.g.
NOTIFY) to such UAs because it fails to parse the request URI as a valid phone
While it may be convenient in some scenarios to have SailFin strictly interpret
the "user=phone" to perform a conversion from SIP to TEL URI, it causes serious
interoperability issues in other cases.
There should be an option to turn off strict processing of the "user=phone"
parameter, such that when this option is set, SailFin will not attempt to
perform any validation/conversion and treat the URI as a regular SIP URI.