Page 394 - Asterisk™: The Future of Telephony

username (peer)
The username field allows you to attempt contact with a peer before it has registered
with you. At registration, a SIP device tells Asterisk which SIP URI to use to contact
it. The username is used in conjunction with defaultip to create the SIP URI in the
SIP INVITE header. This might be useful following a reboot, in order to place a call.
The endpoints will not attempt to register with the server until their registration
timeouts expire, so you will not know their locations. For nondynamic hosts, you
will require the username to be specified, as it is used to construct the authoriza-
tion username:
username=john_smith

366 | Appendix A: VoIP Channels