On Tue, Mar 13, 2012 at 5:17 AM, Emilio Panighetti <emilio...@me.com> wrote:
> That's interesting. So if I read you correctly; sipXecs is a
> stateless proxy only? Similar in objective to SER and its
> derivative projects?

sipXecs includes a stateless proxy called sipXproxy (like SER) and
would be the default path when you're doing unattended transfer
between local registered endpoints.

If you're doing an unattended transfer to a PSTN number however, you
need to consider the gateway capabilities and configuration.


> I tried Freeswitch for this application, but although it
> works, I wasn't impressed on how it rewrites SIP messages
> and related SDP; thus searching for a 'pure sip'
> implementation that lead me to sipXecs.
>
> The SBC used in this case can process the REFER; but in
> doing so it means the From: and To: headers won't be
> rewritten by sipXecs as it's done on INVITEs.
> Also, if sipXecs won't intervene in putting calls on/off
> hold; what's the purpose of the MOH implementation within
> sipXecs? How is a typical implementation supposed to work?

MOH uses Freeswitch, so sipXproxy won't intervene but Freeswitch will

> Somehow I expected sipXecs would be stateful; although not
> necessarily a B2BUA as stated in the 'why-sipxecs' page on
> the sipfoundry portal; thus being able to handle basic PBX
> functionality internally.

I guess you could say sipXecs is stateful as a whole, but sipXproxy is
not, so unless you're dial plan involves Freeswitch, sipXbridge the
SIP is mostly passed thru unchanged.


> Perhaps an example would be appropriate. Is there a sort of
> showcase implementation that mentions the role of different
> network elements in relation to sipXecs? Like the handling
> of call transfers and MOH.

n, but would be nice. rummage around on wiki, you may find some gems.

disclaimer: Not a SIP guy, but I play one on mailing list.
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