On Thu, 2007-03-01 at 13:00 -0600, Dien Ba Quang wrote:
> Hello,
> 
> I'm developing a soft phone with SipXPBX 3.6 . Because I'm newbie in
> SIPX and also in SIP, I have some problems with maintaining the buddy
> list for my soft phone. I don't really know how SipX server does with
> SUBSCRIBE messages. As I understood, the diagram might be: 
> 
> UA1 -------(subscribe)----------> SIPX -------(subscribe)--------> UA2
> UA1 <-----( 200 OK  )------------ SIPX <-----------( 200 OK )----- UA2
> UA1 <-----( notify     )------------ SIPX <-----------
> ( notify )-------- UA2 
> UA1 -------( 200 OK  )-----------> SIPX ------------( 200 OK )---->
> UA2
> 
> So, SIPX just does forwarding all the SUBSCRIBE and NOTIFY messages to
> clients.
> Is that true for SIPX 3.6?

Yes.  Since sipX is "true SIP", it functions as a "proxy" (as SIP
defines that) and passes requests and responses between the UAs, just as
you have diagrammed it.

Dale


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