TCP/UDP ports used by Call Manager for H 323 Communication
I have a Call Manager and IP Phones behind a Firewall. At the other side of the firewall i have a router with 2 FXS ports. I have connected two analog phones to these FXS ports. Now in the Call Manager i have added the router as a H 323 Gateway in order to have communication between the IP Phones and the Analog phones.
I want to know what ports are to be opened at the Firewall so that this communication can occur.
Re: TCP/UDP ports used by Call Manager for H 323 Communication
If it's an h323-aware firewall ala PIX, you need a "fixup protocol h323 1720" which tells the FW to start to eavsdrop on port 1720 (h225 call setup) so it can glean the remainder of the ports to be opened (h245 & RTP).
The PIX acl or conduit must also allow the GW IP address in on port 1720 to begin the signalling process.
If you don't have an H323-aware FW, you have to allow ALOT of ports inbound from the GW:
TCP 1720 for h225,
TCP 4000-4999 for H245 (I think - the IOS gw's used a different range of ports than the AS5xxx gw's,
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