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What is a SIP Trunk?

A SIP trunk is a virtual connection between an organization's on-premises PBX (Private Branch Exchange) and an Internet Telephony Service Provider (ITSP) that supports the Session Initiation Protocol (SIP). SIP trunks are used for voice and video communication over the internet. 

SIP Trunk Applications

SIP trunking is employable in a variety of applications, including: 

  • PSTN origination/termination – to connect businesses to the PSTN. 
  • Site-to-site connectivity – to interconnect geographically distributed business locations. 
  • Cloud or hosted service connectivity – to connect businesses to remotely hosted communications services such as voice or video conferencing services. 

Benefits of SIP Trunks

SIP trunks allow organizations to use their existing PBX infrastructure to make and receive phone calls over the internet, providing several benefits, including:

  • Cost savings
  • Scalability
  • Flexibility
  • Geographic flexibility
  • Advanced features
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