Is that possible to use SIP in LAN network?

I don't know enough about SIP. As far as I know SIP can not be used in LAN. But it's features are very good. I want to use it for a LAN messenger (with video confe开发者_JAVA百科rence facilities).

Is there any way of using SIP in LAN network ?

The SIP protocol can be used over any reliable transport (TCP, XMPP, instant messaging channel, etc...) to a service (e.g. a server such as a SIP proxy) that knows how to route the SIP INVITE message from the caller to the callee. e.g. If you send an INVITE to bob@foobar.com, there's needs to be a service that knows how to find "bob" and deliver the message. Likewise, when Bob sends back his response messages back, the messages need to route back to the caller who sent the original INVITE.

And you can do SIP without a server - provided the computer already have a connection (direct or indirect) to the other computer intended for the call.

But SIP isn't anything special. If you were to invent your own video conferencing protocol, it would probably look a lot like SIP. SIP's primary job is for both sides of a call to exchange IP/port candidates for connecting directly in addition to codec and bandwidth negotiation data.

After the SIP messages are exchanged, ICE/STUN/TURN take over and RTP packets typically flow. SIP isn't used in the call except to end the call.

What are you really trying to do anyway?

Thread is Old but still I would like to contribute to this. There are various SIP server like http://www.officesip.com/index.html which works in LAN and can be connected to hardware phone too and soft client also. Jitsi is open source cross platform SIP/xmpp client:https://jitsi.org/ And if you want to XMPP server Openfire is the best:http://www.igniterealtime.org/projects/openfire/

I hope this will definitely help someone..!