Connecting to the world with gateways
The counterpart to having a user register to your FreeSWITCH server is to have your server register as a user on a remote server. This is accomplished using gateways. A gateway is quite simply an outbound registration to another SIP server. Telephone service providers use very large servers to provide SIP trunks to their subscribers. In FreeSWITCH, we can use a gateway to connect to a SIP provider. We can also use a gateway to connect to another SIP server, such as another FreeSWITCH server or any SIP-compliant IP-PBX.
Setting up a new gateway
A gateway simply connects to a SIP server just like a SIP phone connects to FreeSWITCH. As such, a gateway configuration bears some resemblance to a SIP phone configuration. Like a SIP phone registering to FreeSWITCH, a gateway has some minimum requirements. They are as follows:
Username and password
Server address or IP, and port
These values are supplied by the service provider. Occasionally there are other parameters...
