asterisk users - Oct 2006 - Multiple line phones with different contexts

Hey all,

Has anyone had any issues with phones having multiple lines that are in
different contexts?  We've got a couple phones that we're testing
intercom functionality for, and I'm noticing that for some strange
reason, no matter what line we use, the phones tend to be completely in
one context or another, not segregated like I would expect.

Our contexts look like this:
context intercom {
        _XXXX => {
                Answer;
                &check-cid();
                Set(CALLERID(num)=${CALLERID(num)} (INT));
                SIPAddHeader(Alert-Info: Ring Answer);
                &createds(${EXTEN});
                Dial(SIP/${ds}|20);
                Hangup;
        };
};

context long-distance {
        includes {
                local;
        };

        _9011 => &dialout(${EXTEN});
        _91NXXNXXXXXX => &dialout(${EXTEN});
};

The phones are configured as such:
[0004F2100526_1]
canreinvite=no
context=long-distance
host=dynamic
nat=no
qualify=60000
secret=secret
type=peer
regexten=44198

[0004F2100526_2]
canreinvite=no
context=intercom
host=dynamic
nat=no
qualify=60000
secret=secret
type=peer
regexten=44198

A sip debug from one of the intercoms:
<-- SIP read from 10.20.136.130:5060:
INVITE sip:4000@tcm1.shsu.edu:5060;user=phone SIP/2.0
Via: SIP/2.0/UDP 10.20.136.130;branch=z9hG4bK2a5fd1d91B78BACE
From: "Aaron Daniel"
<sip:0004F2100526_2@tcm1.shsu.edu>;tag=DDF0722-FFF8D457
To: <sip:4000@tcm1.shsu.edu;user=phone>
CSeq: 1 INVITE
Call-ID: dd12cb03-99065278-efdfa12d@10.20.136.130
Contact: <sip:0004F2100526_2@10.20.136.130>
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, INFO, MESSAGE, SUBSCRIBE,
NOTIFY, PRACK, UPDATE, REFER
User-Agent: PolycomSoundPointIP-SPIP_430-UA/2.0.1.0291
Supported: 100rel,replaces
Allow-Events: talk,hold,conference
Max-Forwards: 70
Content-Type: application/sdp
Content-Length: 251

v=0
o=- 1161637564 1161637564 IN IP4 10.20.136.130
s=Polycom IP Phone
c=IN IP4 10.20.136.130
t=0 0
a=sendrecv
m=audio 2240 RTP/AVP 0 8 18 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=rtpmap:101 telephone-event/8000

--- (14 headers 11 lines)---
Using INVITE request as basis request -
dd12cb03-99065278-efdfa12d@10.20.136.130
Sending to 10.20.136.130 : 5060 (non-NAT)
Found peer '0004F2100526_1'
Found RTP audio format 0
Found RTP audio format 8
Found RTP audio format 18
Found RTP audio format 101
Peer audio RTP is at port 10.20.136.130:2240
Found description format PCMU
Found description format PCMA
Found description format G729
Found description format telephone-event
Capabilities: us - 0x8000e (gsm|ulaw|alaw|h263), peer - audio=0x10c
(ulaw|alaw|g729)/video=0x0 (nothing), combined - 0xc (ulaw|alaw)
Non-codec capabilities: us - 0x1 (telephone-event), peer - 0x1
(telephone-event), combined - 0x1 (telephone-event)
Looking for 4000 in long-distance (domain tcm1.shsu.edu)
Reliably Transmitting (no NAT) to 10.20.136.130:5060:
SIP/2.0 484 Address Incomplete
Via: SIP/2.0/UDP
10.20.136.130;branch=z9hG4bK2a5fd1d91B78BACE;received=10.20.136.130
From: "Aaron Daniel"
<sip:0004F2100526_2@tcm1.shsu.edu>;tag=DDF0722-FFF8D457
To: <sip:4000@tcm1.shsu.edu;user=phone>;tag=as04c17ab8
Call-ID: dd12cb03-99065278-efdfa12d@10.20.136.130
CSeq: 1 INVITE
User-Agent: SCM1 - Sip Call Manager 1
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:4000@10.20.136.6>
Content-Length: 0


---
tcm1*CLI>
<-- SIP read from 10.20.136.130:5060:
ACK sip:4000@tcm1.shsu.edu:5060 SIP/2.0
Via: SIP/2.0/UDP 10.20.136.130;branch=z9hG4bK2a5fd1d91B78BACE
From: "Aaron Daniel"
<sip:0004F2100526_2@tcm1.shsu.edu>;tag=DDF0722-FFF8D457
To: <sip:4000@tcm1.shsu.edu;user=phone>;tag=as04c17ab8
CSeq: 1 ACK
Call-ID: dd12cb03-99065278-efdfa12d@10.20.136.130
Contact: <sip:0004F2100526_2@10.20.136.130>
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, INFO, MESSAGE, SUBSCRIBE,
NOTIFY, PRACK, UPDATE, REFER
User-Agent: PolycomSoundPointIP-SPIP_430-UA/2.0.1.0291
Max-Forwards: 70
Content-Length: 0


--- (11 headers 0 lines)---
Destroying call 'dd12cb03-99065278-efdfa12d@10.20.136.130'

Finally, a sip show peer on the intercom line proving asterisk knows
it's in the right context:
tcm1*CLI> sip show peer 0004F2100526_2
tcm1*CLI>

  * Name       : 0004F2100526_2
  Secret       : <Set>
  MD5Secret    : <Not set>
  Context      : intercom
  Subscr.Cont. : <Not set>
  Language     :
  AMA flags    : Unknown
  CallingPres  : Presentation Allowed, Not Screened
  Callgroup    :
  Pickupgroup  :
  Mailbox      : 4198@default
  VM Extension : asterisk
  LastMsgsSent : 0
  Call limit   : 0
  Dynamic      : Yes
  Callerid     : "" <>
  Expire       : 2252
  Insecure     : port,invite
  Nat          : RFC3581
  ACL          : No
  CanReinvite  : No
  PromiscRedir : No
  User=Phone   : No
  Trust RPID   : No
  Send RPID    : Yes
  DTMFmode     : rfc2833
  LastMsg      : 0
  ToHost       :
  Addr->IP     : 10.20.136.130 Port 5060
  Defaddr->IP  : 0.0.0.0 Port 5060
  Def. Username: 0004F2100526_2
  SIP Options  : (none)
  Codecs       : 0x8000e (gsm|ulaw|alaw|h263)
  Codec Order  : (none)
  Status       : OK (14 ms)
  Useragent    : PolycomSoundPointIP-SPIP_430-UA/2.0.1.0291
  Reg. Contact : sip:0004F2100526_2@10.20.136.130

ANY help would be greatly appreciated :)

-- 
Aaron Daniel
Computer Systems Technician
Sam Houston State University
amdtech@shsu.edu
(936) 294-4198