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SIP trunk does NOT response against 200 OK messages

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SIP trunk does NOT response against 200 OK messages
sip trunk recording 200 ok
Answer
9/21/12 9:52 AM
hello,
 
i`m trying to get a rtp stream
 
 
i got a INVITE message like below from cm 
 
=============== from CM =======================
 
 
INVITE sip:2999@172.17.17.15:5060 SIP/2.0
Via: SIP/2.0/TCP 172.17.17.11:5060;branch=z9hG4bK1b066218d23
From: <sip:2004@172.17.17.11;x-nearend;x-refci=20942068;x-nearenddevice=SEP58BC277554A2;x-farendrefci=20942069;x-farenddevice=SEP00254595B341;x-farendaddr=2002>;tag=536~916fa243-9f70-4a7b-9599-bb6044937543-20942073
To: <sip:2999@172.17.17.15>
Date: Fri, 21 Sep 2012 07:23:49 GMT
Call-ID: 48333600-5c11605-1b1-b1111ac@172.17.17.11
Supported: timer,resource-priority,replaces
Min-SE:  1800
User-Agent: Cisco-CUCM8.6
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
CSeq: 101 INVITE
Expires: 180
Allow-Events: presence, kpml
Supported: X-cisco-srtp-fallback
Supported: Geolocation
Call-Info: <sip:172.17.17.11:5060>;method="NOTIFY;Event=telephone-event;Duration=500"
Cisco-Guid: 1211315712-0000065536-0000000433-0185668012
Session-Expires:  1800
P-Preferred-Identity: <sip:2004@172.17.17.11>
Remote-Party-ID: <sip:2004@172.17.17.11>;party=calling;screen=no;privacy=off
Contact: <sip:2004@172.17.17.11:5060;transport=tcp>;isFocus
Max-Forwards: 70
Content-Length: 0
 
==============================================================================================
 
so, i generate a 200 OK message and send
 
============== sent messages ============================================

SIP/2.0 200 OK
Via: SIP/2.0/TCP 172.17.17.11:5060;branch=z9hG4bK1b066218d23
From: <sip:2004@172.17.17.11;x-nearend;x-refci=20942068;x-nearenddevice=SEP58BC277554A2;x-farendrefci=20942069;x-farenddevice=SEP00254595B341;x-farendaddr=2002>;tag=536~916fa243-9f70-4a7b-9599-bb6044937543-20942073
To: <sip:2999@172.17.17.15>
Call-ID: 48333600-5c11605-1b1-b1111ac@172.17.17.11
User-Agent: Cisco-CUCM8.6
Allow: INVITE,OPTIONS,INFO,BYE,CANCEL,ACK,PRACK,UPDATE,REFER,SUBSCRIBE,NOTIFY,PUBLISH
CSeq: 101 INVITE
Contact: <sip:2004@172.17.17.11:5060;transport=tcp>;isFocus
Content-Type: application/sdp
Content-Length: 154
 
v=0
o=PhoneUP_Recorder 5000 1 IN IP4 172.17.17.15
s=SIP Call
c=IN IP4 172.17.17.15
t=0 0
m=audio 5000 RTP/AVP 0
a=rtpmap:0 PCMU/8000
a=ptime:20
===============================================================================

 
but, any response message does not come
 
please, help me what is wrong....
 
 
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