| English | German |
| Session Initiation Protocol | Session Initiation-Protokoll (A standard signaling protocol for establishing multi-media communications sessions between two or more users over an IP network) |
| Session Initiation Protocol trunking A mechanism for connecting the voice network of an enterprise to a service provider that offers public switched telephone network (PSTN) origination, termination, and emergency services without deploying PSTN gateways | SIP-Trunking (Session Initiation-Protokoll) |