Cisco 2824 gateway

I have CCM 4.2 and TRIXBOX 2.2 like SIP Trunk for each other, so CCM’s exts can make calls Trixbox’s ext and viceversa and works fantastic.

I need use a Cisco 2825 Gateway with 1 T1 , like a Gateway (or Trunk) for FreePBX
Any idea ??

Gateway cisco2825 IP address:
Trixbox IP address:

Thak you