Here is a portion of the details of the error report
Date/Time: 2012-08-21 20:44:43 -0700
OS Version: 10.7.4 (Build 11E53)
Report Version: 4
iChat Connection Log:
2012-08-21 20:41:33 -0700: 0x7fa73705ee10: State change from Waiting to Connecting.
2012-08-21 20:44:39 -0700: 0x7fa73705ee10: State change from Connecting to Ended.
2012-08-21 20:44:39 -0700: 0x7fa73705ee10: Error 1008 (Did not receive a response from 0x7fa73705ee10.)
2012-08-21 20:44:39 -0700: 0x7fa7370140e0: State change from Invited to Ended.
2012-08-21 20:44:39 -0700: 0x7fa7370140e0: Error 1008 (Did not receive a response from 0x7fa7370140e0.)
Video Conference Error Report:
33.116248 @/SourceCache/VideoConference/VideoConference-454.1/SIP/SIP.c:2919 type=4 (900A0015/0)
[SIPConnectIPPort failed]
11277.568556 @/SourceCache/VideoConference/VideoConference-454.1/SIP/SIP.c:2919 type=4 (900A0015/0)
[SIPConnectIPPort failed]
11279.671656 @/SourceCache/VideoConference/VideoConference-454.1/SIP/SIP.c:2919 type=4 (900A0015/0)
[SIPConnectIPPort failed]
15120.840489 @/SourceCache/VideoConference/VideoConference-454.1/SIP/SIP.c:2919 type=4 (900A0015/0)
[SIPConnectIPPort failed]
15122.947792 @/SourceCache/VideoConference/VideoConference-454.1/SIP/SIP.c:2919 type=4 (900A0015/0)
[SIPConnectIPPort failed]
31582.193806 @/SourceCache/VideoConference/VideoConference-454.1/Video Conference/DotMacConfiguration.m:858 type=4 (FFFFFFFF/0)
[HTTP GET failed (0)]
44633.916797 @/SourceCache/VideoConference/VideoConference-454.1/Video Conference/DotMacConfiguration.m:858 type=4 (FFFFFFFF/0)
[HTTP GET failed (0)]
44633.919038 @/SourceCache/VideoConference/VideoConference-454.1/Video Conference/DotMacConfiguration.m:858 type=4 (FFFFFFFF/0)
[HTTP GET failed (0)]