Here's the Axon SIP log. As you can see the 487 Request Terminated seems completely out of the blue and unexpected.
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00:21:30 UDP Packet Received from 192.168.1.11:5071 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
INVITE sip:82024562461@wondermoose SIP/2.0
Via: SIP/2.0/UDP 192.168.1.11:5071;rport;branch=z9hG4bK513380
To: <sip:82024562461@wondermoose>
From: "Zippy" <sip:101@wondermoose>;tag=10000
Call-ID: 1224877325-3380-WONDERMOOSE@192.168.1.11
CSeq: 594 INVITE
Max-Forwards: 20
User-Agent: NCH Software Express Talk 3.10
Contact: <sip:101@192.168.1.11:5071>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, INFO, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: 352
v=0
o=NCHSoftware-Talk 1224877350 1224877364 IN IP4 192.168.1.11
s=Express Talk Call
c=IN IP4 192.168.1.11
t=0 0
m=audio 8000 RTP/AVP 0 8 96 3 13 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:96 G726-32/8000
a=rtpmap:3 GSM/8000
a=rtpmap:13 CN/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=sendrecv
a=direction:active
----------------------------------------------------------------
00:21:30 UDP Packet Sent to 192.168.1.11:5071 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
SIP/2.0 407 Proxy Authentication Required
Via: SIP/2.0/UDP 192.168.1.11:5071;rport;branch=z9hG4bK513380
To: <sip:82024562461@wondermoose>
From: "Zippy" <sip:101@wondermoose>;tag=10000
Call-ID: 1224877325-3380-WONDERMOOSE@192.168.1.11
CSeq: 594 INVITE
User-Agent: NCH Software Axon Virtual PBX 2.01
Proxy-Authenticate: Digest realm="axon@wondermoose",nonce="v97093qaq25916w",opaque="",stale=FALSE,algorithm=MD5
Content-Length: 0
----------------------------------------------------------------
00:21:30 UDP Packet Received from 192.168.1.11:5071 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
ACK sip:82024562461@wondermoose SIP/2.0
Via: SIP/2.0/UDP 192.168.1.11:5071;rport;branch=z9hG4bK513380
To: <sip:82024562461@wondermoose>
From: "Zippy" <sip:101@wondermoose>;tag=10000
Call-ID: 1224877325-3380-WONDERMOOSE@192.168.1.11
CSeq: 594 ACK
Max-Forwards: 20
User-Agent: NCH Software Express Talk 3.10
Content-Length: 0
----------------------------------------------------------------
00:21:30 UDP Packet Received from 192.168.1.11:5071 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
INVITE sip:82024562461@wondermoose SIP/2.0
Via: SIP/2.0/UDP 192.168.1.11:5071;rport;branch=z9hG4bK523380
To: <sip:82024562461@wondermoose>
From: "Zippy" <sip:101@wondermoose>;tag=10000
Call-ID: 1224877325-3380-WONDERMOOSE@192.168.1.11
CSeq: 595 INVITE
Max-Forwards: 20
User-Agent: NCH Software Express Talk 3.10
Contact: <sip:101@192.168.1.11:5071>
Proxy-Authorization: Digest username="101",realm="axon@wondermoose",nonce="v97093qaq25916w",uri="sip:82024562461@wondermoose",response="b8ff0a22dfc68b9c487188500a2d3da1",opaque="",algorithm=MD5
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, INFO, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: 352
v=0
o=NCHSoftware-Talk 1224877350 1224877364 IN IP4 192.168.1.11
s=Express Talk Call
c=IN IP4 192.168.1.11
t=0 0
m=audio 8000 RTP/AVP 0 8 96 3 13 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:96 G726-32/8000
a=rtpmap:3 GSM/8000
a=rtpmap:13 CN/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=sendrecv
a=direction:active
----------------------------------------------------------------
00:21:30 UDP Packet Sent to 192.168.1.11:5071 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 192.168.1.11:5071;rport;branch=z9hG4bK523380
To: <sip:82024562461@wondermoose>;tag=7480
From: "Zippy" <sip:101@wondermoose>;tag=10000
Call-ID: 1224877325-3380-WONDERMOOSE@192.168.1.11
CSeq: 595 INVITE
User-Agent: NCH Software Axon Virtual PBX 2.01
Content-Length: 0
----------------------------------------------------------------
00:21:30 UDP Packet Sent to 192.168.1.11:5061 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
INVITE sip:2024562461@192.168.1.11:5061 SIP/2.0
Via: SIP/2.0/UDP 192.168.1.11:5060;rport;branch=z9hG4bK171816
To: <sip:2024562461@>
From: "Zippy" <sip:Carousel@192.168.1.11:5060>;tag=7479
Call-ID: 1224876930-1816-WONDERMOOSE@192.168.1.11
CSeq: 766 INVITE
Max-Forwards: 19
User-Agent: NCH Software Axon Virtual PBX 2.01
Contact: <sip:Carousel@192.168.1.11:5060>
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, INFO, REFER, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: 352
v=0
o=NCHSoftware-Talk 1224877350 1224877364 IN IP4 192.168.1.11
s=Express Talk Call
c=IN IP4 192.168.1.11
t=0 0
m=audio 8000 RTP/AVP 0 8 96 3 13 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:96 G726-32/8000
a=rtpmap:3 GSM/8000
a=rtpmap:13 CN/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=sendrecv
a=direction:active
----------------------------------------------------------------
00:21:30 UDP Packet Received from 192.168.1.11:5061 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 192.168.1.11:5060;rport;branch=z9hG4bK171816
To: <sip:2024562461@>;tag=8227
From: "Zippy" <sip:Carousel@192.168.1.11:5060>;tag=7479
Call-ID: 1224876930-1816-WONDERMOOSE@192.168.1.11
CSeq: 766 INVITE
User-Agent: Carousel 1.00
Content-Length: 0
----------------------------------------------------------------
00:21:30 UDP Packet Sent to 192.168.1.11:5071 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 192.168.1.11:5071;rport;branch=z9hG4bK523380
To: <sip:82024562461@wondermoose>;tag=7480
From: "Zippy" <sip:101@wondermoose>;tag=10000
Call-ID: 1224877325-3380-WONDERMOOSE@192.168.1.11
CSeq: 595 INVITE
User-Agent: NCH Software Axon Virtual PBX 2.01
Content-Length: 0
----------------------------------------------------------------
00:21:30 UDP Packet Received from 192.168.1.11:5061 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 192.168.1.11:5060;rport;branch=z9hG4bK171816
To: <sip:2024562461@>;tag=8227
From: "Zippy" <sip:Carousel@192.168.1.11:5060>;tag=7479
Call-ID: 1224876930-1816-WONDERMOOSE@192.168.1.11
CSeq: 766 INVITE
User-Agent: Carousel 1.00
Content-Length: 0
----------------------------------------------------------------
00:21:30 UDP Packet Received from 192.168.1.11:5061 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 192.168.1.11:5060;rport;branch=z9hG4bK171816
To: <sip:2024562461@>;tag=8227
From: "Zippy" <sip:Carousel@192.168.1.11:5060>;tag=7479
Call-ID: 1224876930-1816-WONDERMOOSE@192.168.1.11
CSeq: 766 INVITE
User-Agent: Carousel 1.00
Content-Length: 0
----------------------------------------------------------------
00:21:32 UDP Packet Sent to 192.168.1.11:5071 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 192.168.1.11:5071;rport;branch=z9hG4bK523380
To: <sip:82024562461@wondermoose>;tag=7480
From: "Zippy" <sip:101@wondermoose>;tag=10000
Call-ID: 1224877325-3380-WONDERMOOSE@192.168.1.11
CSeq: 595 INVITE
User-Agent: NCH Software Axon Virtual PBX 2.01
Content-Length: 0
----------------------------------------------------------------
00:21:32 UDP Packet Received from 192.168.1.11:5061 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 192.168.1.11:5060;rport;branch=z9hG4bK171816
To: <sip:2024562461@>;tag=8227
From: "Zippy" <sip:Carousel@192.168.1.11:5060>;tag=7479
Call-ID: 1224876930-1816-WONDERMOOSE@192.168.1.11
CSeq: 766 INVITE
User-Agent: Carousel 1.00
Content-Length: 0
----------------------------------------------------------------
00:21:33 UDP Packet Received from 192.168.1.11:5061 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
SIP/2.0 487 Request Terminated
Via: SIP/2.0/UDP 192.168.1.11:5060;rport;branch=z9hG4bK171816
To: <sip:2024562461@>;tag=8227
From: "Zippy" <sip:Carousel@192.168.1.11:5060>;tag=7479
Call-ID: 1224876930-1816-WONDERMOOSE@192.168.1.11
CSeq: 766 INVITE
User-Agent: Carousel 1.00
Content-Length: 0
----------------------------------------------------------------
00:21:33 UDP Packet Sent to 192.168.1.11:5061 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
ACK sip:2024562461@192.168.1.11:5061 SIP/2.0
Via: SIP/2.0/UDP 192.168.1.11:5060;rport;branch=z9hG4bK171816
To: <sip:2024562461@>;tag=8227
From: "Zippy" <sip:Carousel@192.168.1.11:5060>;tag=7479
Call-ID: 1224876930-1816-WONDERMOOSE@192.168.1.11
CSeq: 766 ACK
Max-Forwards: 20
User-Agent: NCH Software Axon Virtual PBX 2.01
Content-Length: 0
----------------------------------------------------------------
00:21:33 UDP Packet Sent to 192.168.1.11:5071 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
SIP/2.0 480 Temporarily Unavailable
Via: SIP/2.0/UDP 192.168.1.11:5071;rport;branch=z9hG4bK523380
To: <sip:82024562461@wondermoose>;tag=7480
From: "Zippy" <sip:101@wondermoose>;tag=10000
Call-ID: 1224877325-3380-WONDERMOOSE@192.168.1.11
CSeq: 595 INVITE
User-Agent: NCH Software Axon Virtual PBX 2.01
Content-Length: 0
----------------------------------------------------------------
00:21:33 UDP Packet Received from 192.168.1.11:5071 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
ACK sip:82024562461@wondermoose SIP/2.0
Via: SIP/2.0/UDP 192.168.1.11:5071;rport;branch=z9hG4bK523380
To: <sip:82024562461@wondermoose>;tag=7480
From: "Zippy" <sip:101@wondermoose>;tag=10000
Call-ID: 1224877325-3380-WONDERMOOSE@192.168.1.11
CSeq: 595 ACK
Max-Forwards: 20
User-Agent: NCH Software Express Talk 3.10
Proxy-Authorization: Digest username="101",realm="axon@wondermoose",nonce="v97093qaq25916w",uri="sip:82024562461@wondermoose",response="b8ff0a22dfc68b9c487188500a2d3da1",opaque="",algorithm=MD5
Content-Length: 0
----------------------------------------------------------------