Here is the SIP transaction log. Caller called 7176 (Cisco 7960) from outside PSTN line, 7185(polycom 601, ip: 192.168.2.104) is the phone which monitors 7176.
Reliably Transmitting (no NAT) to 192.168.2.104:5060:
NOTIFY sip:[EMAIL PROTECTED] SIP/2.0
Via: SIP/2.0/UDP 192.168.2.66:5060;branch=z9hG4bK567ba18b
From: <sip:[EMAIL PROTECTED]>;tag=as28665c79
To: " Wang" <sip:[EMAIL PROTECTED]>;tag=1B2B2C20-22A9C0D1
Contact: <sip:[EMAIL PROTECTED]>
Call-ID: [EMAIL PROTECTED]
CSeq: 107 NOTIFY
User-Agent: Asterisk PBX
Max-Forwards: 70
Event: presence
Content-Type: application/xpidf+xml
Subscription-State: active
Content-Length: 349
<?xml version="1.0"?>
<!DOCTYPE presence PUBLIC "-//IETF//DTD RFCxxxx XPIDF 1.0//EN" "xpidf.dtd">
<presence>
<presentity uri="sip:[EMAIL PROTECTED];method=SUBSCRIBE" />
<atom id="7176">
<address uri="sip:[EMAIL PROTECTED];user=ip" priority="0.800000">
<status status="inuse" />
<msnsubstatus substatus="onthephone" />
</address>
</atom>
</presence>
<-- SIP read from 192.168.2.104:5060:
SIP/2.0 500 Internal Server Error
Via: SIP/2.0/UDP 192.168.2.66:5060;branch=z9hG4bK567ba18b
From: <sip:[EMAIL PROTECTED]>;tag=as28665c79
To: " Wang" <sip:[EMAIL PROTECTED]>;tag=1B2B2C20-22A9C0D1
CSeq: 107 NOTIFY
Call-ID: [EMAIL PROTECTED]
Contact: <sip:[EMAIL PROTECTED]>
Event: presence
User-Agent: PolycomSoundPointIP-SPIP_601-UA/1.6.4.0064
Content-Length: 0
<-- SIP read from 192.168.2.104:5060:
SUBSCRIBE sip:[EMAIL PROTECTED] SIP/2.0
Via: SIP/2.0/UDP 192.168.2.104;branch=z9hG4bKfdb7ef6c9DE13403
From: " Wang" <sip:[EMAIL PROTECTED]>;tag=1B2B2C20-22A9C0D1
To: <sip:[EMAIL PROTECTED]>;tag=as28665c79
CSeq: 29 SUBSCRIBE
Call-ID: [EMAIL PROTECTED]
Contact: <sip:[EMAIL PROTECTED]>
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, INFO, MESSAGE, SUBSCRIBE, NOTIFY, PRACK, UPDATE, REFER
Event: presence
User-Agent: PolycomSoundPointIP-SPIP_601-UA/1.6.4.0064
Authorization: Digest username="7185", realm="asterisk", nonce="4eb67954", uri="sip:[EMAIL PROTECTED]", response="3d264007cfea7ea28cf53fd4f9b12417", algorithm=MD5
Max-Forwards: 70
Expires: 3600
Content-Length: 0
Transmitting (no NAT) to 192.168.2.104:5060:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.2.104;branch=z9hG4bKfdb7ef6c9DE13403;received=192.168.2.104
From: " Wang" <sip:[EMAIL PROTECTED]>;tag=1B2B2C20-22A9C0D1
To: <sip:[EMAIL PROTECTED]>;tag=as28665c79
Call-ID: [EMAIL PROTECTED]
CSeq: 29 SUBSCRIBE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Expires: 3600
Contact: <sip:[EMAIL PROTECTED]>;expires=3600
Content-Length: 0
---
Reliably Transmitting (no NAT) to 192.168.2.104:5060:
NOTIFY sip:[EMAIL PROTECTED] SIP/2.0
Via: SIP/2.0/UDP 192.168.2.66:5060;branch=z9hG4bK7601a9bd
From: <sip:[EMAIL PROTECTED]>;tag=as28665c79
To: " Wang" <sip:[EMAIL PROTECTED]>;tag=1B2B2C20-22A9C0D1
Contact: <sip:[EMAIL PROTECTED]>
Call-ID: [EMAIL PROTECTED]
CSeq: 108 NOTIFY
User-Agent: Asterisk PBX
Max-Forwards: 70
Event: presence
Content-Type: application/xpidf+xml
Subscription-State: active
Content-Length: 349
<?xml version="1.0"?>
<!DOCTYPE presence PUBLIC "-//IETF//DTD RFCxxxx XPIDF 1.0//EN" "xpidf.dtd">
<presence>
<presentity uri="sip:[EMAIL PROTECTED];method=SUBSCRIBE" />
<atom id="7176">
<address uri="sip:[EMAIL PROTECTED];user=ip" priority="0.800000">
<status status="inuse" />
<msnsubstatus substatus="onthephone" />
</address>
</atom>
</presence>
<-- SIP read from 192.168.2.104:5060:
SIP/2.0 500 Internal Server Error
Via: SIP/2.0/UDP 192.168.2.66:5060;branch=z9hG4bK7601a9bd
From: <sip:[EMAIL PROTECTED]>;tag=as28665c79
To: " Wang" <sip:[EMAIL PROTECTED]>;tag=1B2B2C20-22A9C0D1
CSeq: 108 NOTIFY
Call-ID: [EMAIL PROTECTED]
Contact: <sip:[EMAIL PROTECTED]>
Event: presence
User-Agent: PolycomSoundPointIP-SPIP_601-UA/1.6.4.0064
Content-Length: 0
Reliably Transmitting (no NAT) to 192.168.2.104:5060:
NOTIFY sip:[EMAIL PROTECTED] SIP/2.0
Via: SIP/2.0/UDP 192.168.2.66:5060;branch=z9hG4bK212f2520
From: <sip:[EMAIL PROTECTED]>;tag=as28665c79
To: " Wang" <sip:[EMAIL PROTECTED]>;tag=1B2B2C20-22A9C0D1
Contact: <sip:[EMAIL PROTECTED]>
Call-ID: [EMAIL PROTECTED]
CSeq: 109 NOTIFY
User-Agent: Asterisk PBX
Max-Forwards: 70
Event: presence
Content-Type: application/xpidf+xml
Subscription-State: active
Content-Length: 344
<?xml version="1.0"?>
<!DOCTYPE presence PUBLIC "-//IETF//DTD RFCxxxx XPIDF 1.0//EN" "xpidf.dtd">
<presence>
<presentity uri="sip:[EMAIL PROTECTED];method=SUBSCRIBE" />
<atom id="7176">
<address uri="sip:[EMAIL PROTECTED];user=ip" priority="0.800000">
<status status="open" />
<msnsubstatus substatus="online" />
</address>
</atom>
</presence>
<-- SIP read from 192.168.2.104:5060:
SIP/2.0 500 Internal Server Error
Via: SIP/2.0/UDP 192.168.2.66:5060;branch=z9hG4bK212f2520
From: <sip:[EMAIL PROTECTED]>;tag=as28665c79
To: " Wang" <sip:[EMAIL PROTECTED]>;tag=1B2B2C20-22A9C0D1
CSeq: 109 NOTIFY
Call-ID: [EMAIL PROTECTED]
Contact: <sip:[EMAIL PROTECTED]>
Event: presence
User-Agent: PolycomSoundPointIP-SPIP_601-UA/1.6.4.0064
Content-Length: 0
