Hi,
 
I am running some continuous testing hitting FS.  There are a couple errors that gets popped up occasionally and I am trying to find out why.  In one of the trace, I am seeing FS not sending 183.  The weird thing is that this problem is not happening everything, but on a very rarely basis.  Also, there is no error message being sent.  Does anyone know under what situation would freeswitch not sending out 183?
 
recv 771 bytes from udp/[192.168.1.122]:5060 at 14:28:50.460222:
   ------------------------------------------------------------------------
   INVITE sip:0019008@192.168.1.116:5070 SIP/2.0
   Record-Route: <sip:192.168.1.122;lr=on;ftag=9>
   Via: SIP/2.0/UDP 192.168.1.122;branch=z9hG4bKe6e9.09c88aa1.0
   Via: SIP/2.0/UDP 192.168.1.6:7001
   From: 19008 <sip:19008@192.168.1.122:7001>;tag=9
   To: 0019008 <sip:0019008@192.168.1.122>
   Call-ID: 9-10894@192.168.1.6
   CSeq: 2 INVITE
   Contact: <sip:19008@192.168.1.6:7001>
   Max-Forwards: 69
   User-Agent: Performance Test
   Content-Type: application/sdp
   Content-Length:   272
   P-hint: inbound->inbound
  
   v=0
   o=user1 53655765 2353687637 IN IP4 192.168.1.6
   s=-
   t=0 0
   c=IN IP4 192.168.1.6
   m=audio 6032 RTP/AVP 0 9 8 3 101
   a=rtpmap:0 PCMU/8000
   a=rtpmap:9 G722/8000
   a=rtpmap:8 PCMA/8000
   a=rtpmap:3 GSM/8000
   a=rtpmap:101 telephone-event/8000
   a=fmtp:101 0-15
   a=sendrecv
   ------------------------------------------------------------------------
send 354 bytes to udp/[192.168.1.122]:5060 at 14:28:50.460805:
   ------------------------------------------------------------------------
   SIP/2.0 100 Trying
   Via: SIP/2.0/UDP 192.168.1.122;branch=z9hG4bKe6e9.09c88aa1.0
   Via: SIP/2.0/UDP 192.168.1.6:7001
   Record-Route: <sip:192.168.1.122;lr=on;ftag=9>
   From: 19008 <sip:19008@192.168.1.122:7001>;tag=9
   To: 0019008 <sip:0019008@192.168.1.122>
   Call-ID: 9-10894@192.168.1.6
   CSeq: 2 INVITE
   User-Agent: Freeswitch Media Gateway
   Content-Length: 0
  
   ------------------------------------------------------------------------
2009-01-20 09:28:50 [NOTICE] switch_channel.c:565 switch_channel_set_name() New Channel sofia/internal/19008@192.168.1.122:7001 [a7f0594e-e6fe-11dd-9a2c-fbbebdd2887f]
2009-01-20 09:28:50 [INFO] mod_dialplan_xml.c:233 dialplan_hunt() Processing 19008->0019008 in context public
2009-01-20 09:28:50 [INFO] switch_ivr_async.c:1653 switch_ivr_bind_dtmf_meta_session() Bound A-Leg: 1 execute_extension::a_record XML features
2009-01-20 09:28:50 [INFO] switch_ivr_async.c:1653 switch_ivr_bind_dtmf_meta_session() Bound A-Leg: 2 execute_extension::a_stoprecord XML features
2009-01-20 09:28:50 [INFO] switch_ivr_async.c:1653 switch_ivr_bind_dtmf_meta_session() Bound A-Leg: 3 execute_extension::a_att_xfer XML features
2009-01-20 09:28:50 [INFO] switch_ivr_async.c:1660 switch_ivr_bind_dtmf_meta_session() Bound B-Leg: 1 execute_extension::b_record XML features
2009-01-20 09:28:50 [INFO] switch_ivr_async.c:1660 switch_ivr_bind_dtmf_meta_session() Bound B-Leg: 2 execute_extension::b_stoprecord XML features
2009-01-20 09:28:50 [INFO] switch_ivr_async.c:1660 switch_ivr_bind_dtmf_meta_session() Bound B-Leg: 3 execute_extension::b_att_xfer XML features
2009-01-20 09:28:50 [NOTICE] switch_channel.c:565 switch_channel_set_name() New Channel sofia/internal/19008 [a816c7fa-e6fe-11dd-9a2c-fbbebdd2887f]
send 1229 bytes to udp/[192.168.1.122]:5060 at 14:28:50.715136:
   ------------------------------------------------------------------------
   INVITE sip:19008@192.168.1.122:5060 SIP/2.0
   Via: SIP/2.0/UDP 192.168.1.116:5070;rport;branch=z9hG4bKKe15F6Dap2jBa
   Max-Forwards: 68
   From: "19008" <sip:FreeswitchMediaGateway@openser;transport=udp>;tag=mB8gaveZvmF8K
   To: <sip:19008@192.168.1.122:5060>
   Call-ID: 7f75543a-61a1-122c-8282-001517871e28
   CSeq: 110112529 INVITE
   Contact: <sip:FreeswitchMediaGateway@192.168.1.116:5070;transport=udp>
   User-Agent: Freeswitch Media Gateway
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE, REGISTER, INFO, PUBLISH
   Supported: timer, precondition, path, replaces
   Allow-Events: talk, presence, dialog, call-info, sla, include-session-description, presence.winfo, message-summary, refer
   Min-SE: 120
   Content-Type: application/sdp
   Content-Disposition: session
   Content-Length: 335
   P-hint: inbound->inbound
   Remote-Party-ID: "19008" <sip:19008@openser>;screen=yes;privacy=off
  
   v=0
   o=FreeSWITCH 5551695261821560906 6736752020354058642 IN IP4 192.168.1.116
   s=FreeSWITCH
   c=IN IP4 192.168.1.116
   t=0 0
   m=audio 12016 RTP/AVP 0 9 8 3 101 13
   a=rtpmap:0 PCMU/8000
   a=rtpmap:9 G722/8000
   a=rtpmap:8 PCMA/8000
   a=rtpmap:3 GSM/8000
   a=rtpmap:101 telephone-event/8000
   a=fmtp:101 0-16
   a=rtpmap:13 CN/8000
   a=ptime:20
   ------------------------------------------------------------------------
recv 354 bytes from udp/[192.168.1.122]:5060 at 14:28:50.745112:
   ------------------------------------------------------------------------
   SIP/2.0 100 Giving a try
   Via: SIP/2.0/UDP 192.168.1.116:5070;rport=5070;branch=z9hG4bKKe15F6Dap2jBa
   From: "19008" <sip:FreeswitchMediaGateway@openser;transport=udp>;tag=mB8gaveZvmF8K
   To: <sip:19008@192.168.1.122:5060>
   Call-ID: 7f75543a-61a1-122c-8282-001517871e28
   CSeq: 110112529 INVITE
   Server: OpenSIPS (1.4.3-notls (x86_64/linux))
   Content-Length: 0
  
   ------------------------------------------------------------------------
recv 438 bytes from udp/[192.168.1.122]:5060 at 14:28:50.748929:
   ------------------------------------------------------------------------
   SIP/2.0 180 Ringing
   Via: SIP/2.0/UDP 192.168.1.116:5070;received=192.168.1.116;rport=5070;branch=z9hG4bKKe15F6Dap2jBa
   Record-Route: <sip:192.168.1.122;lr=on;ftag=mB8gaveZvmF8K>
   From: "19008" <sip:FreeswitchMediaGateway@openser;transport=udp>;tag=mB8gaveZvmF8K
   To: <sip:19008@192.168.1.122:5060>;tag=9
   Call-ID: 7f75543a-61a1-122c-8282-001517871e28
   CSeq: 110112529 INVITE
   Contact: <sip:192.168.1.7:7000;transport=UDP>
   Content-Length: 0
  
   ------------------------------------------------------------------------
recv 740 bytes from udp/[192.168.1.122]:5060 at 14:28:50.749130:
   ------------------------------------------------------------------------
   SIP/2.0 200 OK
   Via: SIP/2.0/UDP 192.168.1.116:5070;received=192.168.1.116;rport=5070;branch=z9hG4bKKe15F6Dap2jBa
   Record-Route: <sip:192.168.1.122;lr=on;ftag=mB8gaveZvmF8K>
   From: "19008" <sip:FreeswitchMediaGateway@openser;transport=udp>;tag=mB8gaveZvmF8K
   To: <sip:19008@192.168.1.122:5060>;tag=9
   Call-ID: 7f75543a-61a1-122c-8282-001517871e28
   CSeq: 110112529 INVITE
   Contact: <sip:192.168.1.7:7000;transport=UDP>
   Content-Type: application/sdp
   Content-Length:   272
  
2009-01-20 09:28:50 [NOTICE] sofia.c:2627 sofia_handle_sip_i_state() Ring-Ready sofia/internal/19008!
   v=0
   o=user1 53655765 2353687637 IN IP4 192.168.1.7
   s=-
   c=IN IP4 192.168.1.7
   t=0 0
   m=audio 6000 RTP/AVP 0 9 8 3 101
   a=rtpmap:0 PCMU/8000
   a=rtpmap:9 G722/8000
   a=rtpmap:8 PCMA/8000
   a=rtpmap:3 GSM/8000
   a=rtpmap:101 telephone-event/8000
   a=fmtp:101 0-15
   a=sendrecv
   ------------------------------------------------------------------------
send 463 bytes to udp/[192.168.1.122]:5060 at 14:28:50.749566:
   ------------------------------------------------------------------------
   ACK sip:192.168.1.7:7000;transport=UDP SIP/2.0
   Via: SIP/2.0/UDP 192.168.1.116:5070;rport;branch=z9hG4bKmQtyH1yDKB9XN
   Route: <sip:192.168.1.122;lr=on;ftag=mB8gaveZvmF8K>
   Max-Forwards: 70
   From: "19008" <sip:FreeswitchMediaGateway@openser;transport=udp>;tag=mB8gaveZvmF8K
   To: <sip:19008@192.168.1.122:5060>;tag=9
   Call-ID: 7f75543a-61a1-122c-8282-001517871e28
   CSeq: 110112529 ACK
   Contact: <sip:FreeswitchMediaGateway@192.168.1.116:5070;transport=udp>
   Content-Length: 0
  
   ------------------------------------------------------------------------
2009-01-20 09:28:50 [NOTICE] sofia.c:3065 sofia_handle_sip_i_state() Channel [sofia/internal/19008] has been answered
2009-01-20 09:28:50 [INFO] mod_sofia.c:1294 sofia_receive_message() Asked to send early media by sofia/internal/19008@192.168.1.122:7001
2009-01-20 09:28:50 [INFO] mod_sofia.c:1335 sofia_receive_message() Ring SDP:
v=0
o=FreeSWITCH 1232449708 1232449709 IN IP4 192.168.1.116
s=FreeSWITCH
c=IN IP4 192.168.1.116
t=0 0
m=audio 12022 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20
a=sendrecv
2009-01-20 09:28:50 [NOTICE] mod_sofia.c:1338 sofia_receive_message() Ring-Ready sofia/internal/19008@192.168.1.122:7001!
2009-01-20 09:28:50 [NOTICE] mod_sofia.c:1338 sofia_receive_message() Pre-Answer sofia/internal/19008@192.168.1.122:7001!
2009-01-20 09:28:50 [NOTICE] switch_ivr_originate.c:1838 switch_ivr_originate() Channel [sofia/internal/19008@192.168.1.122:7001] has been answered
send 1058 bytes to udp/[192.168.1.122]:5060 at 14:28:50.820186:
   ------------------------------------------------------------------------
   SIP/2.0 200 OK
   Via: SIP/2.0/UDP 192.168.1.122;branch=z9hG4bKe6e9.09c88aa1.0
   Via: SIP/2.0/UDP 192.168.1.6:7001
   Record-Route: <sip:192.168.1.122;lr=on;ftag=9>
   From: 19008 <sip:19008@192.168.1.122:7001>;tag=9
   To: 0019008 <sip:0019008@192.168.1.122>;tag=K2er80XUZBSNr
   Call-ID: 9-10894@192.168.1.6
   CSeq: 2 INVITE
   Contact: <sip:mod_sofia@192.168.1.116:5070;transport=udp>
   User-Agent: Freeswitch Media Gateway
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE, REGISTER, INFO, PUBLISH
   Supported: timer, precondition, path, replaces
   Allow-Events: talk, presence, dialog, call-info, sla, include-session-description, presence.winfo, message-summary, refer
   Min-SE: 120
   Content-Type: application/sdp
   Content-Disposition: session
   Content-Length: 267
  
   v=0
   o=FreeSWITCH 6403206013178204633 6807646593930218658 IN IP4 192.168.1.116
   s=FreeSWITCH
   c=IN IP4 192.168.1.116
   t=0 0
   m=audio 12022 RTP/AVP 0 101
   a=rtpmap:0 PCMU/8000
   a=rtpmap:101 telephone-event/8000
   a=fmtp:101 0-16
   a=silenceSupp:off - - - -
   a=ptime:20
   ------------------------------------------------------------------------
send 1058 bytes to udp/[192.168.1.122]:5060 at 14:28:51.321221:
   ------------------------------------------------------------------------
   SIP/2.0 200 OK
   Via: SIP/2.0/UDP 192.168.1.122;branch=z9hG4bKe6e9.09c88aa1.0
   Via: SIP/2.0/UDP 192.168.1.6:7001
   Record-Route: <sip:192.168.1.122;lr=on;ftag=9>
   From: 19008 <sip:19008@192.168.1.122:7001>;tag=9
   To: 0019008 <sip:0019008@192.168.1.122>;tag=K2er80XUZBSNr
   Call-ID: 9-10894@192.168.1.6
   CSeq: 2 INVITE
   Contact: <sip:mod_sofia@192.168.1.116:5070;transport=udp>
   User-Agent: Freeswitch Media Gateway
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE, REGISTER, INFO, PUBLISH
   Supported: timer, precondition, path, replaces
   Allow-Events: talk, presence, dialog, call-info, sla, include-session-description, presence.winfo, message-summary, refer
   Min-SE: 120
   Content-Type: application/sdp
   Content-Disposition: session
   Content-Length: 267
  
   v=0
   o=FreeSWITCH 6403206013178204633 6807646593930218658 IN IP4 192.168.1.116
   s=FreeSWITCH
   c=IN IP4 192.168.1.116
   t=0 0
   m=audio 12022 RTP/AVP 0 101
   a=rtpmap:0 PCMU/8000
   a=rtpmap:101 telephone-event/8000
   a=fmtp:101 0-16
   a=silenceSupp:off - - - -
   a=ptime:20
   ------------------------------------------------------------------------