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SIPit 33

Monday December 13, 2021 - Friday December 17, 2021


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 and to Register

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

SIPit 33 Sponsor

We are very proud to have the following company support SIPit 33 through their generous support as event sponsors:

Neustar is an information services and technology company and a leader in identity resolution providing the data and technology that enables trusted connections between companies and people at the moments that matter most. Neustar offers industry-leading solutions in Marketing, Risk, Communications, Security and Registry that responsibly connect data on people, devices and locations, continuously corroborated through billions of transactions. Neustar serves more than 8,000 clients worldwide, including 60 of the Fortune 100 , and over 800 communication service providers.

An industry leader in Caller Identification solutions, Neustar is a co-author of STIR standards, key contributor to the SHAKEN framework, and the exclusive operator of the ATIS Robocalling Testbed which conducts interoperability testing of real-world STIR/SHAKEN implementations against Neustar’s reference implementation. Learn more 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, 2021
Friday December 17, 2021


SIP Forum