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SIPit 33

Monday, December 13 - Friday, December 17


Organized by the SIP Forum, the SIPit events are the world’s premier interoperability testing events for SIP, bringing together leading SIP application developers, service providers and IP communications equipment manufacturers to ensure their SIP implementations work seamlessly together in an IP network testing environment.

The purpose of the SIPit event is to test for interoperability of SIP implementations, to determine the source of incompatibilities, inform new standards work, and drive refinement of the specifications. This event is open only to implementers with working SIP implementations, and the results of testing will be completely anonymous – no attribution to companies or individuals, or products or services will be made.

SIPit is organized by the SIP Forum’s Test Event Working Group (TEWG) and serves as a “plugfest” for participating companies to perform SIP interoperability testing with other participants in a live network environment. To date, the SIP Forum has hosted 32 SIPit events around the globe. The previous event, SIPit 32, was hosted by the University of New Hampshire Interoperability Laboratory (UNH-IOL) in Durham, New Hampshire.

Due to the ongoing pandemic, the SIP Forum will be holding SIPit 33 virtually, with remote connectivity to the testing environment, and will once again be hosted by the UNH-IOL. Meetings associated with the event will be held using a variety of video-conferencing services to facilitate discussion, brainstorming and debugging amongst the event participants.

The main focus for this upcoming SIPit 33 event will be on Secure Telephone Identity (STI) related technologies.

This includes protocols and industry initiated efforts around STIR/SHAKEN in the U.S. as well as some similar and related efforts happening internationally. The event is designed for implementers that wish to test their devices and cloud and premise-based SIP services that implement the protocols related to STI.

SIPit 33 tests can include various protocol-related Interop including:

  • Rich Call Data
  • Certificate Delegation
  • Diversion
  • RPH/911

In addition, participants are welcome to also demonstrate and/or brainstorm topics such as:

  • Display
  • Entity and TN Vetting
  • Certificates/ACME
  • Error Handling


For more information about SIPit 33 please visit the event’s webpage, send an email to, or call +1-203-829-6307.

SIPit 33 registration is now officially open, and the individual participation fee has been set at $150 USD. To register, please visit

For more information about the SIPit events, please visit In addition, summaries of the aspects of the protocol tested at past SIPit events are available at

Sponsorship Information

For companies interested in supporting SIPit 33 through their sponsorship of the event, please contact Marc Robins at +1-203-829-6307 or email to receive information about sponsorship benefits and costs.


Monday, December 13
Friday, December 17


SIP Forum