Configuring an SIP gateway allows you to connect with outside carriers or other SIP machines. You can connect with other FreeSWITCH or Asterisk boxes, or upstream carrier SIP trunks.
SIP gateways have many, many options—too many to list here; so, we'll review just a few.
First, you'll need to gather some information about the remote server to which you want to connect. The list generally includes the following:
5060) of the server that to which you are being connected
You'll also ...