[Asterisk-Users] chan_sccp: incoming calls on multiple lines

[Vic Cross]

G'day list,

I am using the chan_sccp code to attach a SCCP-firmware 7960 to Asterisk.  
I have logged on multiple lines to the phone, and I can select a line for 
outgoing calls by pressing the right button (line goes off-hook, I can 
dial, and * processes the outgoing call according to the context defined 
against the line in chan_sccp.conf).  All great.

I'm having trouble with incoming calls however.  I expected that a call
coming in on any line would be answered when I take the device off-hook.  
However, only an incoming call for the currently selected line (line
selected using the line buttons, as described previously) is answered.  
Worse, it is not possible to select a different line when a call is
incoming: pressing any of the line buttons (including the one for the line
where the call is coming in) results in the phone going off-hook against
the previously-selected line.  I've looked at the chan_sccp code, and it
seems like it's Working-As-Designed.

Having never used a real CallManager system, is this the way that the 7960
works when it's using CallManager, i.e. can you really only answer an
incoming call on the line you previously selected?  I'm about to hack 
chan_sccp to try and make it work like I want, but I'd like to know if I'd 
be breaking the 'correct' function...

Cheers,
Vic Cross