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.
Thanks in advance