Cannot video chat with another iChat user.

Question

Here's the log:
Date/Time: 2007-12-16 19:35:03.644 -0500
OS Version: 10.5.1 (Build 9B18)
Report Version: 4
iChat Connection Log:
2007-12-16 19:34:36 -0500: AVChat started with ID 1649769330.
2007-12-16 19:34:36 -0500: 0x10cb5920: State change from AVChatNoState to AVChatStateWaiting.
2007-12-16 19:34:36 -0500: superbananaplace2: State change from AVChatNoState to AVChatStateInvited.
2007-12-16 19:34:40 -0500: 0x10cb5920: State change from AVChatStateWaiting to AVChatStateConnecting.
2007-12-16 19:34:40 -0500: superbananaplace2: State change from AVChatStateInvited to AVChatStateConnecting.
2007-12-16 19:34:51 -0500: 0x10cb5920: State change from AVChatStateConnecting to AVChatStateConnected.
2007-12-16 19:34:51 -0500: superbananaplace2: State change from AVChatStateConnecting to AVChatStateConnected.
2007-12-16 19:35:01 -0500: 0x10cb5920: State change from AVChatStateConnected to AVChatStateEnded.
2007-12-16 19:35:01 -0500: 0x10cb5920: Error -20 (No data has been received for the last 10 seconds.)
2007-12-16 19:35:01 -0500: superbananaplace2: State change from AVChatStateConnected to AVChatStateEnded.
2007-12-16 19:35:01 -0500: superbananaplace2: Error -20 (No data has been received for the last 10 seconds.)
Video Conference Error Report:
10.067682 @VCU/streamer/RTPTransport.c:2289 type=4 (80010017/0)
[Bandwidth Detection]
[Timeout after a retry - received no packet]
Video Conference Support Report:
0.000000 @SIP/Transport.c:2353 type=1 (00000000/0)
[SIP/2.0 200 OK
Via: SIP/2.0/UDP 69.221.77.232;branch=z9hG4bK148436252b0a14cf
To: 0 <sip:[email protected]:16402>;tag=1047948691
From: u0 <sip:[email protected]>;tag=1489786139
Call-ID: db33c56e-ac37-11dc-9367-a94eeec713c4@192-168-0-101
CSeq: 1 INVITE
Contact: <sip:[email protected]:16402>
User-Agent: Viceroy 1.3
Content-Type: application/sdp
Content-Length: 419
v=0
o=ryan 0 0 IN IP4 68.230.204.128
s=sisonoitaliano1
c=IN IP4 68.230.204.128
b=AS:2147483647
t=0 0
a=hwi:1056:2:2000
a=bandwidthDetection:YES
a=iChatEncryption:NO
m=audio 16402 RTP/AVP 12
a=rtcp:16402
a=rtpID:3162344688
m=video 16402 RTP/AVP 126
a=rtcp:16402
a=rtpmap:126 X-H264/90000
a=RTCP:AUDIO 16402 VIDEO 16402
a=fmtp:126 imagesize 0 rules 15:640:480:640:480
a=framerate:15
a=rtpID:3688903299
0.067048 @SIP/Transport.c:347 type=2 (00000000/0)
[ACK sip:[email protected]:16402 SIP/2.0
Via: SIP/2.0/UDP 69.221.77.232;branch=z9hG4bK4ef30ce43670fef0
Max-Forwards: 70
To: 0 <sip:[email protected]:16402>;tag=1047948691
From: u0 <sip:[email protected]>;tag=1489786139
Call-ID: db33c56e-ac37-11dc-9367-a94eeec713c4@192-168-0-101
CSeq: 1 ACK
User-Agent: Viceroy 1.2
Content-Length: 0
0.067765 @SIP/Transport.c:2353 type=1 (00000000/0)
[SUBSCRIBE sip:[email protected] SIP/2.0
Via: SIP/2.0/UDP 68.230.204.128:16402;branch=z9hG4bK34d77efd263c352b
Max-Forwards: 70
To: u0 <sip:[email protected]>;tag=1489786139
From: 0 <sip:[email protected]:16402>;tag=1047948691
Call-ID: db33c56e-ac37-11dc-9367-a94eeec713c4@192-168-0-101
CSeq: 1 SUBSCRIBE
Contact: <sip:[email protected]:16402>
Event: conference
Expires: 3600
User-Agent: Viceroy 1.3
Content-Length: 0
0.135060 @SIP/Transport.c:347 type=2 (00000000/0)
[SIP/2.0 200 OK
Via: SIP/2.0/UDP 68.230.204.128:16402;branch=z9hG4bK34d77efd263c352b
To: u0 <sip:[email protected]>;tag=1489786139
From: 0 <sip:[email protected]:16402>;tag=1047948691
Call-ID: db33c56e-ac37-11dc-9367-a94eeec713c4@192-168-0-101
CSeq: 1 SUBSCRIBE
Contact: <sip:[email protected]>;isfocus
Expires: 3600
User-Agent: Viceroy 1.2
Content-Length: 0
0.155102 @SIP/Transport.c:347 type=2 (00000000/0)
[NOTIFY sip:[email protected]:16402 SIP/2.0
Via: SIP/2.0/UDP 69.221.77.232;branch=z9hG4bK4be0a15e2f509e4e
Max-Forwards: 70
To: 0 <sip:[email protected]:16402>;tag=1047948691
From: u0 <sip:[email protected]>;tag=1489786139
Call-ID: db33c56e-ac37-11dc-9367-a94eeec713c4@192-168-0-101
CSeq: 2 NOTIFY
Contact: <sip:[email protected]>;isfocus
Event: conference
Subscription-State: active;expires=3600
User-Agent: Viceroy 1.2
Content-Type: application/conference-info+xml
Content-Length: 213
[<c-i v="0" st="f" en="sip:[email protected]">
c<h>i</h><m t="a"/><m t="v"/>
c<h>o</h><m t="a"/><m t="v"/>
</c-i>
0.155774 @SIP/Transport.c:2353 type=1 (00000000/0)
[SIP/2.0 200 OK
Via: SIP/2.0/UDP 69.221.77.232;branch=z9hG4bK4be0a15e2f509e4e
To: 0 <sip:[email protected]:16402>;tag=1047948691
From: u0 <sip:[email protected]>;tag=1489786139
Call-ID: db33c56e-ac37-11dc-9367-a94eeec713c4@192-168-0-101
CSeq: 2 NOTIFY
User-Agent: Viceroy 1.3
Content-Length: 0
10.742326 @SIP/Transport.c:347 type=2 (00000000/0)
[NOTIFY sip:[email protected]:16402 SIP/2.0
Via: SIP/2.0/UDP 69.221.77.232;branch=z9hG4bK2c9aa1482ef66f84
Max-Forwards: 70
To: 0 <sip:[email protected]:16402>;tag=1047948691
From: u0 <sip:[email protected]>;tag=1489786139
Call-ID: db33c56e-ac37-11dc-9367-a94eeec713c4@192-168-0-101
CSeq: 3 NOTIFY
Contact: <sip:[email protected]>;isfocus
Event: conference
Subscription-State: terminated;reason=noresource
User-Agent: Viceroy 1.2
Content-Length: 0
10.742516 @SIP/Transport.c:2353 type=1 (00000000/0)
[SIP/2.0 200 OK
Via: SIP/2.0/UDP 69.221.77.232;branch=z9hG4bK2c9aa1482ef66f84
To: 0 <sip:[email protected]:16402>;tag=1047948691
From: u0 <sip:[email protected]>;tag=1489786139
Call-ID: db33c56e-ac37-11dc-9367-a94eeec713c4@192-168-0-101
CSeq: 3 NOTIFY
User-Agent: Viceroy 1.3
Content-Length: 0
Video Conference User Report:
10.068820 @:0 type=5 (80010017/60)
[Detected bandwidth (kbits/s): 0 up, 0 down. (80010017)
10.070835 @Video Conference/VideoConferenceMultiController.m:1957 type=5 (00000000/0)
[Start Conference With UserID: sisonoitaliano1]
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Answer 1

I've received a similar error message. Try reducing the Bandwidth limit in iChat preferences. If it is set to "none" then I suspect you are experiencing the same phenomena as I have experienced. This occurs when multiple users are running under a mixture of broadband technologies and efficiencies. e.g. DSL vs. Cable. Satellite broadband can be worse.
We theorize that your/our Cable broadband bandwidth is so fast that the sync'ing or handshaking between the machines is outrunning one or all of your participants. This situation would occur when you or one of your participants is running broadband under DSL and the other(s) are running under Cable broadband. So if you're running at a 15Mbps download stream and a 2Mbps upload stream and one of your friends is running on DSL usually 768/368Kbps then there is a broadband mis-match. You'll "time-out" on the sync'ing and handshaking hence the error "you did not respond"!
Try resetting your Bandwidth Limit in iChat Preferences/Video to 1Mbps, and restart iChat. If that doesn't work reset to 500Kbps/restart etc. until it works.
Plz post if this resolves the problem.