h323 with NAT

[pschneck]

Will h323 work with NAT? AS gateway sitting on a RFC1918 network connected to a 3600. The 3600 is configured for NAT.

[teodorgeorgiev]

Yes, H323 can work with NAT. Are you going to place outgoing or receive incoming calls on the AS gateway ?

[pschneck]

We will be doing both.

[dgahm]

If your calls are gatekeeper controlled you will have a problem with RAS unless you use the newer stateful NAT with ALG support.

Some of the applications and protocols that embed source port or IP address information include:

•H.323 Registration, Admission, and Status (RAS) Protocol

http://www.cisco.com/en/US/customer/products/sw/iosswrel/ps5207/products_feature_guide09186a00801fce09.html

[p.sylvester]

i have used Cisco with Voicemaster(gatekeeper). All you need is a router with IOS that supports NAT feautre. Nothing else. The spftphone/ep will get register with the privateIP.

If you want to see it, ssh to GK and put "??" it will show all the registered endpoints, and you can see your private IP there.

it works 100%. If anydoubts , please let me know.

Thanks,

p sylvester

mail@psylvester.net

[dgahm]

Heres a link for configuring H323 fixup through PIX firewalls. According to this, H225 as well as RAS can embed IP addresses in the payload.

http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a00801fc74a.shtml