What is SIP?

SIP means Session Initiation Protocol. A protocol used to initiate, maintain, and terminate communication sessions in VoIP applications. In other words, a sub-protocol that enables VoIP.

What is SIP Trunking?

SIP trunking is a way for you to eliminate your traditional phone provider, while keeping the phone system you already have. Instead of using a conventional phone line, it allows you to operate your entire phone system over the internet.

SIP is the technology that’s used for establishing, modifying, and terminating a voice communication session over the internet. The “trunking” part refers to the virtual link between your private business telephone network or Public Brand Exchange (PBX) and traditional phone network, using an internet connection.

In layman’s terms, SIP trunks replace your phone lines with the internet service you already have.

  • SIP allows for the establishment of user location (i.e. translating from a user’s name to their current network address).
  • SIP provides for feature negotiation so that all of the participants in a session can agree on the features to be supported among them.
  • SIP is a mechanism for call management – for example adding, dropping, or transferring participants.
  • SIP allows for changing features of a session while it is in progress.

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