asterisk users - Nov 2004 - Cisco 7940 multiple line capability questions...

While I wait 2+ weeks for the shipment from cdw that'll allow me to log 
into the Cisco web site to download the SIP firmware, I'm currently 
trying to use a Cisco 7940 phone with the skinny protocol.

So far, I'm able to dial out from it just fine, the problem is answering 
"outside" calls with it.  To be exact, the phone rings just fine, I
just
can't actually pick up the call.

When I do a SIP to Skinny "internal" call within my own network,
things
work as expected:

   -- Executing Dial("SIP/2001-b273",
"Skinny/2002@7940|20|tr") in new
stack
Found device: 7940
   -- skinny_request(2002@7940)
   -- Skinny cw: 0, dnd: 0, so: 0, sno: 0
   -- skinny_call(Skinny/2002@7940-2)
   -- Called 2002@7940
   -- Skinny/2002@7940-2 is ringing
Recieved Open Recieve Channel Ack
   -- Skinny/2002@7940-2 answered SIP/2001-b273

The config responsible for this in extensions.conf is:
exten => 2002,1,Dial(Skinny/2002@7940,20,tr)

Now, *sometimes* when I do a call from the outside in, the call
"rings"
on 7940-1 instead of 7940-2.  This causes the phone to pickup and hangup 
instantly when I attempt to actually answer the call.

I thought I could fix it by doing this:
exten => s,1,Dial(Skinny/2002@7940-2,20,tr)

but I get this error from asterisk instead:
   -- Starting simple switch on 'Zap/1-1'
Nov 12 19:32:32 NOTICE[8731]: chan_zap.c:5436 ss_thread: Got event 2 
(Ring/Answered)...
   -- Executing Dial("Zap/1-1", "Skinny/2002@7940-2|20|tr")
in new stack
Nov 12 19:32:32 NOTICE[8731]: chan_skinny.c:2515 skinny_request: No 
available lines on: 2002@7940-2
Nov 12 19:32:32 NOTICE[8731]: app_dial.c:777 dial_exec: Unable to create 
channel of type 'Skinny'

So I'm wondering if there is a correct way to get asterisk to call one 
line or the other on a single device?  Also, in the skinny.conf file, is 
it possible to configure multiple lines for one device?  So far 
everything I've tried just manages to write over the previous settings 
for the first line.

Any help, or links to more information on this type of thing would be 
appreciated.  I've read through the asterisk document project, and 
googled for "skinny_request: No available lines" without results.
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