[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(a)192.168.10.253 Port 2 : 202(a)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(a)192.168.10.200 Gateway 192.168.10.210 Port 1 : 102(a)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