sipreg

S → C {type: 'sipreg', status: …}

sipreg – SIP registration status. Status result of SIP registration made by SIP user agent in IXNX.

SIP registration is attempted automatically if username supplied in Iam is a valid SIP address. Message sipreg reports its results.

sipreg vs welcome

Depending on system settings some servers may allow you access to basic services even if SIP registration has failed. In such circumstances you will get both a welcome message and a sipreg status:REJECTED message. In some systems you will then be able to contact other users connected to the same server but not be able to make SIP calls.