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SIP Basics

By cciestudy

SIP Server functions

1. SIP Proxy
- does call routing, name lookup, address translation

- forwards SIP messages between endpoints

- if Record Route is enabled, then all messages will be send back and forth via the server. End points do not communicate with each other directly.
2. SIP Registrar

- clients register their address
3. SIP Redirect

- does call routing, name lookup, address translation

SIP loop prevention

When the SIP server gets an INVITE, it checks whether its own address is contained in the VIA field. If yes, the message will not be processed.

This entry was posted on March 4, 2006 at 9:21 pm and is filed under Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

2 Responses to “SIP Basics”

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