> -----Original Message-----
> From: Worley, Dale (BL60:9D30)
> Sent: Wednesday, June 24, 2009 2:24 PM
> To: Beeton, Carolyn (CAR:9D60)
> Cc: [email protected]
> Subject: Re: [sipX-dev] Config for bridged line
> appearances(XX-4762/XX-5439)
>
>
> I assume the UI will need to specify which extensions have
> the SA feature (because we won't want to apply the overhead
> of SA to all AORs).
by "extension" do you mean phone? or appearance? or user? I think we
are coming to agreement that we will designate an AOR ("user") as
shared, and all appearances of it ("lines") will be configured as shared
if the phone they are on support that. (I think you mean "user", based
on the next paragraph - in which case we agree)
>
> The more interesting question is how we specify and configure
> how many "lines" there are for each AOR. IIRC, the SA
> feature is designed so that the different phones on which an
> AOR appears can have different numbers of appearances
> ("lines") for it, but that the SA feature works best if all
> the phones have the same number of appearances (as the users
> would expect). So presumably, each extension ("user") which
> has SA activated will also have a specification for the
> number of its appearances, and that information will be
> propagated into the configuration of each phone on which the
> AOR appears.
>
The agreement we had in the kick-off call with Martin at the start of
development was that we would not implement support for the "multiple
appearances-per-phone" part of the I-D (the x-line-id parameter, later
called appearance or sa:appearance). I have basically ignored this
parameter and let the phones deal with it. Especially, I am not at this
time putting the x-line-id parameter into an Alert-Info header in the
INVITE of a call to the shared AOR, as the I-D requires (which would
require the SAA to be plugged into the Proxy). When the call is
answered at one of the phones, it picks an x-line-id (it knows what
numbers are available, since it sees all the traffic for the group) and
sends it in the dialog;sla NOTIFY.
In our Polycom config plug-in, you can go into Advanced and set the
lineKeys parameter to 2 or more to get more than one button per AOR. It
is possible that calls would be confused if more than one was on hold -
but I think that would be the case anyway, even if all sets had the same
number of appearances, because sets can't be counted on to have all the
buttons in the same place, and even if they did, the person would have
to say "your call is on hold on the second from the bottom button", or
"middle button on the right" or some such nonsense - and even then all
phones would have to guarantee not only the same number of line buttons
for the AOR, but buttons in the same physical place. We could allow
only one appearance of the shared AOR per phone. I would like people to
play with the feature a bit before we make this decision.
Carolyn
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