3. Making a call

3.1. Basic principles

Linphone uses the Session Initiation Protocol to establish the connection with a remote host. In this protocol each caller or callee is identified by a SIP url: sip:user_name@host_name. A sip url is very closed in syntax to an email address, excepted the “sip:“ prefix.

User_name is like a login name on an Unix machine, and host_name is the name or the IP address of the machine the user can be joined.

Note that Sip is a new telecommunication protocol designed to be simple, and it is not compatible with H323 at all.

3.2. Application: two users connected to the internet by a modem

Here is a "simple" way to proceed. The network requirements are :

Scenario:

If you encounter problems, see section 8-problems.

3.3. test trial: you have no friends to call at the moment (because it is too late for example), but would like to know if linphone really works

Since version 0.3.0, linphone comes with a test program called 'sipomatic'. Sipomatic can answer automatically to calls from linphone. To do this: