Harmeet Singh wrote:
Hi,
Though B2BUA is a very generic term for Application server. Given below are the possible differences: 1. Stateful proxy is required to have only transaction state machine. B2BUA will most likely have Call/Dialog State Machine. 2. Stateful proxy shall not modify the SDP/ content of SIP Messages. Whereas B2BUA may do so. 3. Stateful proxy is not party to the session established via it. Whereas B2BUA may choose to terminate the seesion from the caller onto itself and initiate another towards the callee, maintaining relationship between the parties actually in the session.
Generally correct, although not all SIP Application Servers are B2BUAs. Some are just UAs, and some are actually proxies.
For example, a voice-mail application server is typically a UA. It accepts a call, plays a greeting, makes a recording, ends the call, and does something with with the recording.
a Speed Dialer application is usually a proxy -- it takes an incoming request in the local domain, translates the user-part to some AoR, and proxies the request onward. For example, it might get an INVITE with a URI of "[EMAIL PROTECTED]" and proxy that to "sip:[EMAIL PROTECTED]".
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