Asterisk sip configuration: defaultip
If a peer (e.g. a phone) is configured to register to Asterisk (host=dynamic) we can’t place calls to that peer until it registers, ie. tells us where it is to be reached.
If you know where the phone is, you can configure defaultip to the IP address of the phone and username to the username used on the phone. This configuration will be used to place calls to the phone until we have a registration. In the registration process, the phone provides Asterisk with a username and address where it can be reached.
It is also possible to specify a hostname instead of an IP address which can be useful if you do not know your (dynamic) IP Address and use a Dynamic DNS like dyndns.org.
See also
- Asterisk sip username: The username option
- Asterisk config sip.conf
- Asterisk SIP channels
Phone System 