AFAIK SIP assumes by design that user@host has its SIP server running on "host". That what an URI is ment to do and not doing so actually seams ilogical to me.
-----Original Message----- From: 44net-bounces+marius=yo2loj.ro@hamradio.ucsd.edu [mailto:44net-bounces+marius=yo2loj.ro@hamradio.ucsd.edu] On Behalf Of Antonio Querubin Sent: Wednesday, April 23, 2014 15:42 To: AMPRNet working group Subject: Re: [44net] New Wiki Page - Services ... No this has nothing to do with ENUM. In general, one cannot absolutely assume name@domain is reachable at a SIP server running on a host named 'domain'. That's inflexible and is like assuming only host 'domain' will accept email for name@domain. There may not even be an actual host named 'domain' or if there is, it may not be running SIP. Ignoring SRV RRs also means your SIP client/proxy or SBC wouldn't be taking advantage of the resiliency provided by alternate target servers.
Antonio Querubin ...