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AS5400 FGD T1 SIP Disconnect Message question

We have an AS5400 gateway connected to an Excel Switch via DS3 split to T1s on a mux.

The T1s are configured with fgd-eana configuration.

controller T1 7/0:8

framing sf

ds0-group 1 timeslots 1-24 type fgd-eana mf ani-dnis

Below is the dial peer configuration.

dial-peer voice 1234 voip

permission orig

description TEST

huntstop

voice-class codec 1234

session protocol sipv2

incoming called-number 1234

no vad

!

dial-peer voice 1235 pots

permission term

description TEST

destination-pattern 1234

no info-digits

port 7/0:8:1

forward-digits 4

Calls are connecting fine. Its the disconnect where the issue is.

Received:

INVITE sip:12348889990000@10.10.10.10 SIP/2.0

Via: SIP/2.0/UDP 20.20.20.20;rport;branch=z9hG4bK7tK13p814SFXa

Max-Forwards: 69

From: "+15556667777" <sip:005556667777@20.20.20.20;isup-oli=00>;tag=DXvcp6S56j92c

To: <sip:12348889990000@10.10.10.10>

Call-ID: e669b2cc-9bb8-122f-078b-0019b9dde139

CSeq: 21309657 INVITE

Contact: <sip:gw+10.10.10.10@20.20.20.20:5060;transport=udp;gw=10.10.10.10>

User-Agent: FSX-UAC/1.2

Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, NOTIFY

Supported: timer, precondition, path, replaces

Allow-Events: talk, hold, refer

Content-Type: application/sdp

Content-Disposition: session

Content-Length: 233

Remote-Party-ID: "+15556667777" <sip:005556667777@20.20.20.20>;party=calling;screen=yes;privacy=off

Sent:

BYE sip:gw+10.10.10.10@20.20.20.20:5060;transport=udp;gw=10.10.10.10 SIP/2.0

Via: SIP/2.0/UDP  10.10.10.10:5060;branch=z9hG4bKB21F28928

From: <sip:12348889990000@10.10.10.10>;tag=5491E944-1265

To: "+15556667777" <sip:005556667777@20.20.20.20;isup-oli=00>;tag=DXvcp6S56j92c

Date: Wed, 07 Dec 2011 20:57:29 GMT

Call-ID: e669b2cc-9bb8-122f-078b-0019b9dde139

User-Agent: Cisco-SIPGateway/IOS-12.x

Max-Forwards: 70

Timestamp: 1323291503

CSeq: 101 BYE

Reason: Q.850;cause=16

Content-Length: 0

When the disconnect message is sent, the other end does not recognizes the message and call hangs.

The BYE message looks a little odd.

First is the initial BYE message has the field from Contact in the INVITE message.

Second, the From and To fields are flipped.

Would any of the two reasons I just mentioned be the cause of the call hanging?

Any help would be greatly appreciated.

Thank you.

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