[Serusers] PLEASE HELP very simple Dial plan (hotline feature)

Hello Guys

Please help me with this issue

I have 1 fxo gateway with each port registerd as a SIP user

IP: 192.168.10.253

Port 1 : 201@192.168.10.253

Port 2 : 202@192.168.10.253

So on

I have in the other side a Fxs gateways (eg 1 port each)

Gateway 192.168.10.200

Port 1 : 101@192.168.10.200

Gateway 192.168.10.210

Port 1 : 102@192.168.10.200

I need a "hotline" feature if someone call to the por 2 in the FXO automatically calls port 1 in gateway 192.168.10.210

And if someone calls to the port 1 in the FXO automatically calls to 192.168.10.200

And also Viceversa

If I pickup the phone automatically the gateway goes directly to the port 1 in FXO and that only port not port 2

BTW, please incluye where to put this block into the ser.cfg file

Regards

HA