LINPHONE 'S USER MANUAL
<<< Previous |  | Next >>>

# Registering on a SIP server

You can suscribe for services on remote SIP servers. These services can be:

- redirection: linphone will ask the server to create a sip account <sip:your_user_name@the_sip_server>. This account can be used by your friends in order to call you. For example, you are a simple internet user with a 56k modem, and your IP address cannot be static, and you don't have a host name known by name servers. It is impossible for your friends to contact you, unless you send them an email to inform them of your IP address. What you can do easily is to register on the a sip registrar <sip:example_registrar.com> for example. Your username is "bob". When registering to the server, linphone sends your ip address to the server and an account “sip:bob@example_registrar.com” is created on the server. Now your friends Jim can call you using the address <sip:bob@example_registrar.com>. Of course "example_registrar.com" is supposed to be a well-known domain name. Then Jim's linphone will receive a redirection message to tell the exact location of Bob. And so linphone will ring at Bob's house.

- proxy: this is exactly the same principle, excepted that the server will not send a redirection message to jim's phone. Instead of that it will redirect directly the call to Bob's linphone.

The registrar you've registered on can also be used as an outbound proxy. This is usefull when using linphone behind a firewall. The outbound proxy takes the same role as a http proxy in private subnets. All outcoming calls from linphone will be addressed to the proxy, that will be in charge to redirect the call to person which is supposed to be in the external network.

To use a registrar server with linphone, go to the property box, section SIP, and then toggle the button “use registrar”. Give the address of the registrar in the appropriate field, and then choose the type of services you request from this registrar: redirect or proxy, by toggling the corresponding buttons. You can also toggle the “Use registrar as an outbound proxy” if you need the registrar server to proxy your calls to an external network.

Finnaly click the OK button of the property box. Linphone will close it and immediately talk to the registrar server to inform it of your exact location. When linphone shutdowns, it will take a few seconds to unregister your location from the registrar.

A list of public registrar servers can be found at http://www.cs.columbia.edu/~hgs/sip/servers.html.

Unfortunately, many of these servers don't work anymore, maybe caused by the recent crisis in telecommunications. Some other require authentification methods that are currently not supported by linphone.

In order for you not to lost your time, a list of working public sip servers usable with linphone is availlable on the old linphone 's web site at http://simon.morlat.free.fr/english/servers.html.

<<< Previous | Home | Next >>>
Address book |  | Behind a firewall