Session Initiation Protocol Trunking

S IP Trunking is the industry standard application-layer protocol used for peer-to-peer communications and multimedia, including voice, video, email and instant messaging.

Basic Facts

SIP Trunking uses VoIP to connect a PBX between the Internet and the Public Switched Telephone Network (PSTN), replacing a traditional “phone trunk” such as a Primary Rate Interface (PRI) or analog line.  This solution requires an on-premise PBX and a gateway to connect your Internet telephony service provider to a PBX.

Trunking to a Hosted PBX is typically done using SIP.

SIP Trunking’s primary functions include:

  • Locating the User
  • Selecting the end system for a session
  • Learning user availability
  • Determining the capability of the end-user system
  • Establishing a session(call)
  • Managing the call session, including termination, transfers and more

SIP Trunking

Pros and Cons

  • Leverages your IP Network, turning voice into an application on the network.

  • Potential for improved cost efficiency and cost savings.

  • Additional call appearances can be added quickly without having to wait for more circuits to be installed.

  • Call appearances can be routed to other sites quickly so you have flexibility with where phone service is being provided.

  • Effective bandwidth analysis to protect QoS is especially important, due to multimedia transmissions.

  • Can require higher investment costs, due to needing to acquire new equipment and retire old equipment.

  • The newness of this technology can make finding talent and troubleshooting help more challenging.

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