Is the "username" required to place a SIP call?

I was wondering whether the format:


is enforced by the SIP standard and whether the SIP equipment manufacturers allow a call simply sent to a host at port 5060.

In other words, is the following theoretically and/or in practical use allowed?:


If a SIP device has only one phone number, shouldn't that default phone ring when no user is specified?


Reply to
Ramon F Herrera
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You can simply dial the recipients IP No. (replacing . with *). Regards, Martin

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