| A | B |
|---|
| VOIP | an application that uses a combination of hardware and software to provide |
| IP | protocol used to move data on modern systems |
| ITSP | This system will take your Internet telephone call and place it onto the national telephone system of the person you are calling |
| Telephone portability | you can take your telephone adapter with you if you travel, and anyone calling your local number will reach you wherever you are |
| SIP | common control protocol used by VoIP |
| Gateway | a machine which connects two different types of systems |
| PSTN | plain old telephone service |
| superclass softswitch | used to overlay or add VoIP capabilities to the networks of carriers. Supports multiple core applications on a single platform, including local, long distance, and tandem. |
| PBX | a telephone system within an enterprise that switches calls between enterprise users on local lines while allowing all users to share a certain number of external phone lines |
