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lifesize video conference issue

Hi all,

I have a video conference system behind a cisco 1812.

It works fine with SIP but not with H323.

Calls with H323 are dropped after 30 seconds.

I have static NAT.

inbound ACL :

access-list 102 permit tcp any host xxx.xxx.xxx.xxx eq www

access-list 102 permit tcp any host xxx.xxx.xxx.xxx eq 443

access-list 102 permit tcp any host xxx.xxx.xxx.xxx eq 558

access-list 102 permit tcp any host xxx.xxx.xxx.xxx eq 1023

access-list 102 permit tcp any host xxx.xxx.xxx.xxx eq 1024

access-list 102 permit tcp any host xxx.xxx.xxx.xxx eq 1503

access-list 102 permit tcp any host xxx.xxx.xxx.xxx eq 1718

access-list 102 permit tcp any host xxx.xxx.xxx.xxx eq 1719

access-list 102 permit tcp any host xxx.xxx.xxx.xxx eq 1720

access-list 102 permit tcp any host xxx.xxx.xxx.xxx eq 4001

access-list 102 permit tcp any host xxx.xxx.xxx.xxx eq 11720

access-list 102 permit tcp any host xxx.xxx.xxx.xxx eq 17518

access-list 102 permit tcp any host xxx.xxx.xxx.xxx range 60000 60005

access-list 102 permit udp any host xxx.xxx.xxx.xxx eq 1023

access-list 102 permit udp any host xxx.xxx.xxx.xxx eq 1024

access-list 102 permit udp any host xxx.xxx.xxx.xxx eq 1718

access-list 102 permit udp any host xxx.xxx.xxx.xxx eq 1719

access-list 102 permit udp any host xxx.xxx.xxx.xxx eq 1720

access-list 102 permit udp any host xxx.xxx.xxx.xxx eq 5060

access-list 102 permit udp any host xxx.xxx.xxx.xxx eq 17518

access-list 102 permit udp any host xxx.xxx.xxx.xxx range 60000 60025

I wonder if is there a required IOS version I need on my router or some commands I need to enable.

Any ideas ?

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