Comunication error while starting a video chat

Question

i've video chatted with other people before but sometimes it says there's a communication error
details:
Date/Time: 2008-08-15 16:34:00.782 -0400
OS Version: 10.5.4 (Build 9E17)
Report Version: 4
iChat Connection Log:
2008-08-15 16:33:45 -0400: AVChat started with ID 1610454157.
2008-08-15 16:33:45 -0400: sickw1thit5: State change from AVChatNoState to AVChatStateWaiting.
2008-08-15 16:33:45 -0400: 0x1ce9e2c0: State change from AVChatNoState to AVChatStateInvited.
2008-08-15 16:33:50 -0400: 0x1ce9e2c0: State change from AVChatStateInvited to AVChatStateConnecting.
2008-08-15 16:33:50 -0400: sickw1thit5: State change from AVChatStateWaiting to AVChatStateConnecting.
2008-08-15 16:33:52 -0400: 0x1ce9e2c0: State change from AVChatStateConnecting to AVChatStateEnded.
2008-08-15 16:33:52 -0400: 0x1ce9e2c0: Error -7 (0x1ce9e2c0 cancelled the connection.)
2008-08-15 16:33:52 -0400: sickw1thit5: State change from AVChatStateConnecting to AVChatStateEnded.
2008-08-15 16:33:52 -0400: sickw1thit5: Error -7 (0x1ce9e2c0 cancelled the connection.)
Video Conference Error Report:
12.108368 @SIP/SIP.c:2719 type=4 (900A0015/0)
[SIPConnectIPPort failed]
2221.371934 @SIP/SIP.c:2719 type=4 (900A0015/0)
[SIPConnectIPPort failed]
Video Conference Support Report:
10.107406 @SIP/Transport.c:2362 type=1 (00000000/0)
[INVITE sip:user@rip SIP/2.0
Via: SIP/2.0/UDP sip:16402;branch=z9hG4bK1ebe709b5f2221e5
Max-Forwards: 70
To: "u0" <sip:user@rip>
From: "0" <sip:user@lip:16402>;tag=821055662
Call-ID: 532a0354-6b04-11dd-913c-b8e1b5104012@lip
CSeq: 1 INVITE
Contact: <sip:user@sip:16402>;isfocus
User-Agent: Viceroy 1.3
Content-Type: application/sdp
Content-Length: 725
v=0
o=Robby 0 0 IN IP4 sip
s=0
c=IN IP4 sip
b=AS:2147483647
t=0 0
a=hwi:1028:2:2400
a=iChatEncryption:NO
a=bandwidthDetection:YES
m=audio 16402 RTP/AVP 110 121 12 3 0
a=rtcp:16402
a=rtpmap:121 speex/16000
a=rtpmap:122 speex/8000
a=rtpmap:113 X-AAC_LD/44100
a=rtpmap:110 X-AAC_LD/22050
a=rtpmap:3 GSM/8000
a=rtpmap:0 PCMU/8000
a=rtpID:552982111
m=video 16402 RTP/AVP 123 126 34
a=rtcp:16402
a=rtpmap:123 H264/90000
a=rtpmap:126 X-H264/90000
a=rtpmap:34 H263/90000
a=fmtp:34 imagesize 1 rules 30:352:288
a=framerate:30
a=RTCP:AUDIO 16402 VIDEO 16402
a=fmtp:126 imagesize 0 rules 20:640:480:640:480:20
a=fmtp:123 imagesize 0 rules 20:640:480:640:480:20
a=rtpID:993516357
10.607729 @SIP/Transport.c:2362 type=1 (00000000/0)
[INVITE sip:user@rip SIP/2.0
Via: SIP/2.0/UDP sip:16402;branch=z9hG4bK1ebe709b5f2221e5
Max-Forwards: 70
To: "u0" <sip:user@rip>
From: "0" <sip:user@lip:16402>;tag=821055662
Call-ID: 532a0354-6b04-11dd-913c-b8e1b5104012@lip
CSeq: 1 INVITE
Contact: <sip:user@sip:16402>;isfocus
User-Agent: Viceroy 1.3
Content-Type: application/sdp
Content-Length: 725
v=0
o=Robby 0 0 IN IP4 sip
s=0
c=IN IP4 sip
b=AS:2147483647
t=0 0
a=hwi:1028:2:2400
a=iChatEncryption:NO
a=bandwidthDetection:YES
m=audio 16402 RTP/AVP 110 121 12 3 0
a=rtcp:16402
a=rtpmap:121 speex/16000
a=rtpmap:122 speex/8000
a=rtpmap:113 X-AAC_LD/44100
a=rtpmap:110 X-AAC_LD/22050
a=rtpmap:3 GSM/8000
a=rtpmap:0 PCMU/8000
a=rtpID:552982111
m=video 16402 RTP/AVP 123 126 34
a=rtcp:16402
a=rtpmap:123 H264/90000
a=rtpmap:126 X-H264/90000
a=rtpmap:34 H263/90000
a=fmtp:34 imagesize 1 rules 30:352:288
a=framerate:30
a=RTCP:AUDIO 16402 VIDEO 16402
a=fmtp:126 imagesize 0 rules 20:640:480:640:480:20
a=fmtp:123 imagesize 0 rules 20:640:480:640:480:20
a=rtpID:993516357
11.608112 @SIP/Transport.c:2362 type=1 (00000000/0)
[INVITE sip:user@rip SIP/2.0
Via: SIP/2.0/UDP sip:16402;branch=z9hG4bK1ebe709b5f2221e5
Max-Forwards: 70
To: "u0" <sip:user@rip>
From: "0" <sip:user@lip:16402>;tag=821055662
Call-ID: 532a0354-6b04-11dd-913c-b8e1b5104012@lip
CSeq: 1 INVITE
Contact: <sip:user@sip:16402>;isfocus
User-Agent: Viceroy 1.3
Content-Type: application/sdp
Content-Length: 725
v=0
o=Robby 0 0 IN IP4 sip
s=0
c=IN IP4 sip
b=AS:2147483647
t=0 0
a=hwi:1028:2:2400
a=iChatEncryption:NO
a=bandwidthDetection:YES
m=audio 16402 RTP/AVP 110 121 12 3 0
a=rtcp:16402
a=rtpmap:121 speex/16000
a=rtpmap:122 speex/8000
a=rtpmap:113 X-AAC_LD/44100
a=rtpmap:110 X-AAC_LD/22050
a=rtpmap:3 GSM/8000
a=rtpmap:0 PCMU/8000
a=rtpID:552982111
m=video 16402 RTP/AVP 123 126 34
a=rtcp:16402
a=rtpmap:123 H264/90000
a=rtpmap:126 X-H264/90000
a=rtpmap:34 H263/90000
a=fmtp:34 imagesize 1 rules 30:352:288
a=framerate:30
a=RTCP:AUDIO 16402 VIDEO 16402
a=fmtp:126 imagesize 0 rules 20:640:480:640:480:20
a=fmtp:123 imagesize 0 rules 20:640:480:640:480:20
a=rtpID:993516357
2219.371959 @SIP/Transport.c:2362 type=1 (00000000/0)
[INVITE sip:user@rip SIP/2.0
Via: SIP/2.0/UDP sip:16402;branch=z9hG4bK7536f7b209d2f8f2
Max-Forwards: 70
To: "u0" <sip:user@rip>
From: "0" <sip:user@lip:16402>;tag=654224358
Call-ID: 78009dc8-6b09-11dd-913c-f5a450774012@lip
CSeq: 1 INVITE
Contact: <sip:user@sip:16402>;isfocus
User-Agent: Viceroy 1.3
Content-Type: application/sdp
Content-Length: 727
v=0
o=Robby 0 0 IN IP4 sip
s=0
c=IN IP4 sip
b=AS:2147483647
t=0 0
a=hwi:1028:2:2400
a=iChatEncryption:NO
a=bandwidthDetection:YES
m=audio 16402 RTP/AVP 110 121 12 3 0
a=rtcp:16402
a=rtpmap:121 speex/16000
a=rtpmap:122 speex/8000
a=rtpmap:113 X-AAC_LD/44100
a=rtpmap:110 X-AAC_LD/22050
a=rtpmap:3 GSM/8000
a=rtpmap:0 PCMU/8000
a=rtpID:4023331687
m=video 16402 RTP/AVP 123 126 34
a=rtcp:16402
a=rtpmap:123 H264/90000
a=rtpmap:126 X-H264/90000
a=rtpmap:34 H263/90000
a=fmtp:34 imagesize 1 rules 30:352:288
a=framerate:30
a=RTCP:AUDIO 16402 VIDEO 16402
a=fmtp:126 imagesize 0 rules 20:640:480:640:480:20
a=fmtp:123 imagesize 0 rules 20:640:480:640:480:20
a=rtpID:2970896882
2219.872445 @SIP/Transport.c:2362 type=1 (00000000/0)
[INVITE sip:user@rip SIP/2.0
Via: SIP/2.0/UDP sip:16402;branch=z9hG4bK7536f7b209d2f8f2
Max-Forwards: 70
To: "u0" <sip:user@rip>
From: "0" <sip:user@lip:16402>;tag=654224358
Call-ID: 78009dc8-6b09-11dd-913c-f5a450774012@lip
CSeq: 1 INVITE
Contact: <sip:user@sip:16402>;isfocus
User-Agent: Viceroy 1.3
Content-Type: application/sdp
Content-Length: 727
v=0
o=Robby 0 0 IN IP4 sip
s=0
c=IN IP4 sip
b=AS:2147483647
t=0 0
a=hwi:1028:2:2400
a=iChatEncryption:NO
a=bandwidthDetection:YES
m=audio 16402 RTP/AVP 110 121 12 3 0
a=rtcp:16402
a=rtpmap:121 speex/16000
a=rtpmap:122 speex/8000
a=rtpmap:113 X-AAC_LD/44100
a=rtpmap:110 X-AAC_LD/22050
a=rtpmap:3 GSM/8000
a=rtpmap:0 PCMU/8000
a=rtpID:4023331687
m=video 16402 RTP/AVP 123 126 34
a=rtcp:16402
a=rtpmap:123 H264/90000
a=rtpmap:126 X-H264/90000
a=rtpmap:34 H263/90000
a=fmtp:34 imagesize 1 rules 30:352:288
a=framerate:30
a=RTCP:AUDIO 16402 VIDEO 16402
a=fmtp:126 imagesize 0 rules 20:640:480:640:480:20
a=fmtp:123 imagesize 0 rules 20:640:480:640:480:20
a=rtpID:2970896882
2220.872712 @SIP/Transport.c:2362 type=1 (00000000/0)
[INVITE sip:user@rip SIP/2.0
Via: SIP/2.0/UDP sip:16402;branch=z9hG4bK7536f7b209d2f8f2
Max-Forwards: 70
To: "u0" <sip:user@rip>
From: "0" <sip:user@lip:16402>;tag=654224358
Call-ID: 78009dc8-6b09-11dd-913c-f5a450774012@lip
CSeq: 1 INVITE
Contact: <sip:user@sip:16402>;isfocus
User-Agent: Viceroy 1.3
Content-Type: application/sdp
Content-Length: 727
v=0
o=Robby 0 0 IN IP4 sip
s=0
c=IN IP4 sip
b=AS:2147483647
t=0 0
a=hwi:1028:2:2400
a=iChatEncryption:NO
a=bandwidthDetection:YES
m=audio 16402 RTP/AVP 110 121 12 3 0
a=rtcp:16402
a=rtpmap:121 speex/16000
a=rtpmap:122 speex/8000
a=rtpmap:113 X-AAC_LD/44100
a=rtpmap:110 X-AAC_LD/22050
a=rtpmap:3 GSM/8000
a=rtpmap:0 PCMU/8000
a=rtpID:4023331687
m=video 16402 RTP/AVP 123 126 34
a=rtcp:16402
a=rtpmap:123 H264/90000
a=rtpmap:126 X-H264/90000
a=rtpmap:34 H263/90000
a=fmtp:34 imagesize 1 rules 30:352:288
a=framerate:30
a=RTCP:AUDIO 16402 VIDEO 16402
a=fmtp:126 imagesize 0 rules 20:640:480:640:480:20
a=fmtp:123 imagesize 0 rules 20:640:480:640:480:20
a=rtpID:2970896882
Video Conference User Report:
0.000000 @:0 type=5 (00000000/16402)
[Local SIP port]
0.333692 @Video Conference/VideoConferenceMultiController.m:1474 type=5 (00000000/0)
[IP And Port Data With Caller IP And Port Data: Obtained 120 bytes of local IP and port data (3 entries). Remote data was 0 bytes (0 entries).
10.026445 @Video Conference/VideoConferenceMultiController.m:1507 type=5 (00000000/0)
[Initiate Conference To User Cert Version: u0 with 120 bytes of connection data.
2045.845707 @Video Conference/VideoConferenceMultiController.m:1474 type=5 (00000000/0)
[IP And Port Data With Caller IP And Port Data: Obtained 120 bytes of local IP and port data (3 entries). Remote data was 0 bytes (0 entries).
2214.779110 @Video Conference/VideoConferenceMultiController.m:1474 type=5 (00000000/0)
[IP And Port Data With Caller IP And Port Data: Obtained 120 bytes of local IP and port data (3 entries). Remote data was 0 bytes (0 entries).
2219.317849 @Video Conference/VideoConferenceMultiController.m:1507 type=5 (00000000/0)
[Initiate Conference To User Cert Version: u0 with 120 bytes of connection data.
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Answer 1

as well as it looking like the routing device has DoS or SPI feature there is no Ping in the Log so it is possible it is alos not allowing Responses to Internet Pings.
iChat sends a Ping so this also needs to be Disabled.
10:55 PM Saturday; August 16, 2008