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Upcoming SIPit Events

Focus on STIR/SHAKEN Interoperability Testing

December 13-17, 2021

Hosted by:

University of New Hampshire Interoperability Laboratory

SIPit 33 Overview

Conducted by the SIP Forum, SIPits 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. It is not a trade show, public demonstration, conference or workshop. The individual results of the event are kept confidential.

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 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 University of New Hampshire Interoperability Laboratory. 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 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

Participant/Attendance Policy

– Only participants are allowed in the event’s virtual rooms.

– Only people with SIP implementations to test are allowed to participate (i.e., ONLY engineers, operational personnel and developers, and NOT marketing personnel or others that wish to just observe the proceedings.)

– Interest in testing SIP implementations that are part of existing standards allows prospective participants into the event, but participants who in addition wish to test other related items that are not included in standards are free to do so if they find a willing partner amongst the other participants.

– The goal is to improve the specifications! Please note that implementations aren’t being proven, and there are no winners, losers, or black-eyes as a result of testing.

– Results of testing will be completely anonymous – no attribution to companies/individuals, or products or services will be made.

– Press releases by participants should be only about their own participation (however, joint releases are fine.)

For More Information and to Register

For more information about SIPit 33, please 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

Once your registration has been approved, you will be provided with login credentials to the SIPit 33 wiki, where information about the event and participants/teams are located, and your email address will be added to the the SIPit mailing list so that you can receive important messages about the event from the organizers and other participants.

For more information about past SIPit events, please visit In addition, summaries of the aspects of the protocols 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.

Past SIPit Events

SIPit 32 was held at the University of New Hampshire Interoperability Laboratory September 12-16, 2016. View the results from SIPit 32.

SIPit 31 was held in Nice, France on September 29 – October 3, 2014, and was hosted by ETSI. View the results from SIPit 31.

SIPit 30 – was held in Raleigh-Durham, North Carolina, February 18-22 2013, and was hosted by Cisco Systems. View the results from SIPit 30.

SIPit 29 – the 29th iteration of the premier International test event for real-time IP communications using the Session Initiation Protocol – was hosted by ETSI in Monte Carlo, Monaco, 24-28 October, 2011. The advanced testing sessions at the SIPit 29 focused on appropriate handling of early media from more than one source, advanced multimedia sessions, secure media, and resilient operation in the presence of NATs and firewalls. View he results from SIPit 29.

SIPit 28 was hosted by Digium on April 11–15, 2011 and held at the Jackson Center in Huntsville, Alabama’s Research Park. A special social event on April 12, 2011 included private admission to the US Space and Rocket Center Museum and a dinner buffet and bar under a real Saturn V rocket at the Davidson Center! View the results from SIPit 28.

SIPit 27 was held in Taipei, Taiwan on November 15th to 19th, 2010, and was hosted by ETSI’s Centre for Testing and Interoperability and ITRI, the Industrial Technology Research Institute.

SIPit 26 was held in Kista – the telecom valley outside Stockholm, Sweden – on May 17-21, 2010 and was hosted by Edvina and Tandberg and sponsored by Ingate, Intertex and .se.

SIPit 25 was held at the University of New Hampshire Interoperability Laboratory (UNH-IOL) in Durham, New Hampshire, on September 14-18, 2009.

SIPit 24 was hosted by the Japan Network Information Center (JPNIC) and the National Institute of Information and Communications Technology (NICT) in Tokyo, Japan the week of May 18-22, 2009.

SIPit 23 was hosted by ETSI in Lannion, FRANCE, October 13-17, 2008.

For more information about SIPit, please visit If you have any additional questions, feel free to contact Marc Robins at

SIPit (Session Initiation Protocol Interoperability Test) is a weeklong event where people bring SIP-enabled products (and services) and exercise them to improve overall interoperability across multiple implementations.

SIPit events are open to anyone with a working SIP implementation. The goal of the events is to refine both the protocol and its implementations. The SIPits are a driving force shaping SIP into a globally interoperable protocol for real time Internet communication services.

Currently, the SIPit events are held when industry participants determine the need to conduct new interop testing. Different companies or organizations host each event, and each host chooses the venue.

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