Victor Kueh wrote:
>
> Dear All,
>
> Correct me if I'm wrong, but is it true to say that SIP
> proxy servers have the same protocol stacks as UACs,
Right. Insofar as parsing a SIP message, generating responses (stateful
proxies only) etc. the SIP proxy servers have the same protocol stacks as
the UAC. The big difference is how the SIP message body is treated; most
proxies -- unless they are fronting firewalls/NATs or doing something
special with the body -- will ignore the SIP message body. UAC/UAS, of
course, have to generate/understand the SIP message bodies as well.
> although they are like 'routers' in SIP architecture?
Right; a SIP proxy is tuned to routing SIP messages using any means at its
disposal -- CGI, CPL, time of day, or any other decision enabler.
- vijay
--
Vijay K. Gurbani vkg@{lucent.com,research.bell-labs.com,acm.org}
Internet Software and eServices Group
Lucent Technologies/Bell Labs Innovations 263 Shuman Blvd., Rm 1A-413
Naperville, Illinois 60566 Voice: +1 630 224 0216 Fax: +1 630 713 0184
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