LINPHONE 'S USER MANUAL | ||
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Registering on a SIP server can be usefull in two main cases:
Your machine does not have a public domain name, which prevents other users to call you as they can't guess your IP address. In this case, you can register to a proxy or redirect sip server to get a public sip address. For example, you are <sip:bob@no-host-name> and let's suppose it exists a redirect or proxy sip server at <sip:myserver.org>. By registering to <sip:myserver.org>, your friends will be able to call you at the address <sip:bob@myserver.org> . The proxy or redirect server myserver.org will forward or redirect the calls from your friends to your exact location.
You are behind a firewall. In order for UDP messages (SIP and RTP are on top of UDP) to go through the firewall correctly, in most cases a SIP proxy running on the firewall machine is necessary. You must indicate to linphone the proxy to be used, and tell it that this proxy is an outbound proxy (ie all messages must go through it).
With linphone>=1.0.0 you can choose to use several proxies simultaneously. Go to the property box, section sip, and click on add proxy. You'll be prompted for proxy address, route and your identity (also known as address of record). This information should be given to you by your sip provider you registered to. Route can be optionnal, so leave it empty in case you don't know what to put here. The identity is the sip address you are known by the proxy. Other users on the network are supposed to always be able to find you at this sip address.
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