What Is A Port Number - Talkswitch 48-CA User Manual

What is a port number?

In an IP address like 64.26.209.103:5060, the port number is the number after the
colon ':' . For this example, 5060 is the specified port.
Port numbers are required so that a computer or device can support multiple
applications or streams of simultaneous data communication. Each stream or
application uses a unique port number. You can think of it like mailing a letter to
friend in an apartment building at a specific address. You need to specify the
apartment number as well as the building address, so that the mail can reach the
proper final destination.
6 T a l k S w i t c h U s e r G u i d e