[EMAIL PROTECTED] wrote:
> Can somebody tell me the exact difference between a BBUA and a stateful
> proxy?
Whether it is stateful or not, a proxy must obey certain rules (in 3261)
about what it may, and may not, do. A UA has different, less restrictive
rules. A B2BUA *can* function in a manner similar to that of a proxy, in
that messages coming in one side typically result in a related message
going out the other side. But because it is a UA to can do things a
proxy is not permitted to do.
For instance, a node could act exactly like a proxy, but store dialog
state. (Hence be a "stateful proxy".) At some point it might use that
state to enable it to send a BYE, terminating the dialog. At the moment
it does that it ceases to be a proxy and becomes a B2BUA.
Note that neither B2BUA nor Stateful Proxy are very precise terms.
B2BUAs can be very much like proxies, as above. But there are other
kinds of B2BUAs, such as conference foci and 3pcc controllers, that bear
little resemblance to a proxy. Stateful proxies vary depending on how
much state they contain. At the simplest level there are stateless
proxies, transaction stateful proxies, dialog stateful proxies, call
stateful proxies, and registration stateful proxies.
Paul
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