On Sat, 2009-02-28 at 01:01 -0500, Sanjay Sinha (sanjsinh) wrote:
> >Call-waiting is always implemented locally on the phone in
> >SIP, so I don't see the need for a SIP ACH function for it.
>
> I think it is an ACH feature in the sense that the proxy can decide
> whether to extend the call to called party or send 486 otherwise.
That assumes that the proxy is call-stateful, that is, it knows whether
there is a call on the phone or not. In some SIP systems, proxies do
not track that information.
> >But it looks like "barring outgoing" functions are all
> >implemented in the UA, and so aren't an ACH function per se.
> >("Barring incoming" needs to be done at the proxy, so that's
> >an ACH function.)
>
> How about the case where a system administrator sets barring outgoing
> calls based on Class of Service for a given user.
That's still a function that needs to be configured into the UA (since
the UA can address an INVITE that circumvents any particular proxy).
Dale
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