On gateway number one, you set a static route to the second.
The static route will tell the gateway where to route the calls based on the static route I.P.
One example:
config# be
config be# sr 10
config be sr 10# routename Miami
config be sr 10# callsig 192.168.1.1:1720
config be sr 10# dn 1 1305* 0 1 1
config be sr 10# dn 2 1976* 0 1 1
With these commands, you are seting a static route from this gateway to a gateway in Miami, with I.P. address 192.168.1.1
You are instructing the gateway to route any calls that start with 1305 or 1976 to this gateway for resolution.
Be sure to save the config by typing “submit” on the config# prompt after you finish
On the Miami gateway, do the oposite area codes and i.P. address
You are ready to call from a to b and b to a.
Best regards.