Good Day! Sir i just want to ask if it is possible, i want to connect two gateway via internet connection. I'm using Grandstream GXW4104 for my gateway and 3cx Phone System V.11 Free Edition. What i want is, if our customer call to our 1st office, it can be forwarded to our 2nd office in an extension line via internet connection. Our offices have their own telephone area code and it is a long distance call. Thanks in advance.