# Glossary

Voice REST API Glossary

| Term | Explanation |
|  --- | --- |
| RTC | Real Time Communication |
| SDK | Software Development Kit |
| PSTN | Public Switched Telephone Network (plain old telephony) |
| REST | Representational State Transfer |
| API | Application Programming Interface |
| ACE | Answered Call Event |
| ICE | Incoming Call Event |
| DiCE | Disconnected Call Event |
| CDR | Call Detail Record |
| User Space | Universe of unique user names |
| Data Call | Phone call over the Internet, also known as "VoIP" |
| VoIP | Voice over Internet Protocol (IP) |
| CODEC | Coder/Decoder |
| HTTP | Hyper Text Transfer Protocol |
| RTP | Real Time Protocol |
| UDP | User Datagram Protocol |
| IVR | Interactive Voice Response |
| SMS | Short Message Service |
| NAT | Network Address Translation |
| MXP | Media eXchange Protocol |
| SVAML | Sinch Voice Application Markup Language |
| FQDN | Fully Qualified Domain Name |