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Unable to call video conferencing system at remote site

We are trying to give home users, via their Internet connection, the ability to call video conferencing systems at remote sites. From tests, while calling the remote site video conferencing system, it continues dialing and never connects.


Here's what is showing in syslog:

5/24/2010 3:50:39 PM  Teardown TCP connection 383597 for outside:<source IP>/1720 to inside:<dest IP>/1092 duration 0:02:01 bytes 0 SYN Timeout
5/24/2010 3:48:37 PM  Built outbound TCP connection 383597 for outside:<source IP>/1720 (<source IP>/1720) to inside:<dest IP>/1092
5/24/2010 3:46:20 PM  Deny TCP (no connection) from <source IP>/57502 to 63.172.227.230/1720 flags ACK on interface outside
5/24/2010 3:46:19 PM  Teardown TCP connection 383379 for outside:<source IP>/57502 to inside:<dest IP>/1720 duration 0:00:29 bytes 825 TCP Reset-I
5/24/2010 3:46:19 PM  H225 message ALERTING received from <dest IP>/1720 to <source IP>/57502 before SETUP
5/24/2010 3:46:03 PM  H225 message ALERTING received from <dest IP>/1720 to <source IP>/57502 before SETUP
5/24/2010 3:45:55 PM  H225 message ALERTING received from <dest IP>/1720 to <source IP>/57502 before SETUP
5/24/2010 3:45:51 PM  H225 message ALERTING received from <dest IP>/1720 to <source IP>/57502 before SETUP
5/24/2010 3:45:50 PM  H225 message ALERTING received from <dest IP>/1720 to <source IP>/57502 before SETUP
5/24/2010 3:45:50 PM  Built inbound TCP connection 383379 for outside:<source IP>/57502 (<source IP>/57502) to inside:<dest IP>/1720

The following ports are open to the video conferencing system:

tcp 1503 
udp 1718 
tcp 1718 
udp 1719 
tcp 1719 
tcp h323 
tcp 1731 
tcp ldap 
tcp range 1024 65535 
udp range 1024 65535

fixup is set:

fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719

Has anyone seen this message before?

H225 message ALERTING received from <dest IP>/1720 to <source  IP>/57502 before SETUP

We are using a PIX515E running 6.3(5).

The laptop with the PVX software has permitted the PVX software in the Windows firewall.

Any assistance would be much appreciated.

Regards,

Lily

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