sip trunking vs pri

Sip Trunking vs. PRI – Differences 

Before discussing sip trunking vs. PRI, we must understand that SIP trunking uses VoIP while PRI is for traditional PSTN. PRI lines were introduced after analog lines. With PRI, one can make multiple calls compared to the analog line. With SIP trunking virtually, there is no limit. The limit depends on the internet connection speed.

What are the key points in SIP trunking Vs PRI? 

  1. SIP trunking uses the SIP signaling protocol, while PRI is another protocol for voice circuit setup.
  2. For a single-line PRI, the number of concurrent calls is limited. While with VoIP, the concurrent calls are not fixed.
  3. In SIP trunking, the PBX should be an IP PBX. While in PRI,  traditional PBX works.
  4. PRI does not need any internet connection to work. SIP trunking requires a high-speed internet connection.
  5. In PRI, capacity scaling requires more lines, while additional lines are unnecessary in SIP trunking.
  6. Call quality is guaranteed in PRI. Quality of call in SIP Trunking depends on internet speed.
  7. PRI uses circuit switching, while SIP trunking uses packet switching.
  8. The PRI’s initial setup cost is more, as additional physical lines must be set up between the public switching center and PBX in the office. SIP trunking uses an existing internet connection without any additional physical line.
  9. Failover in SIP trunking is quick. It just needs to switch to the VoIP server. In PRI, it’s not easy as the physical line needs to sift to the new public switch center.

Conclusion for sip trunking vs. PRI:

Both provide the solution for bulk calling. But Sip trunking is more suitable for the business where a low capacity is initially required and can expand later. But PRI is a better option if one needs to assure the quality of service.

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