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Home arrow ACTIVITIES arrow NNI Task Force Intro
NNI Task Force Introduction Print







About the SIP Forum/ATIS NNI Task Force

The global communications industry is currently in the midst of an important transition from the legacy PSTN (Public Switched Telephone Network) infrastructure to a newer, more advanced SIP (Session Initiation Protocol) and IP-based infrastructure. Today, many advanced services cannot reliably work end-to-end because the interconnection between service providers often still occurs via the PSTN’s TDM-based (Time Division Multiplexing) facilities.

Although IP-based SIP interconnection between service providers is increasingly common, each agreement must be negotiated and engineered on a case-by-case basis, leading to duplication of effort. Typically, equipment, such as Session Border Controllers, is used to “normalize” the protocol at the edge of each network to ensure the interconnection will work. The overall effect is to significantly increase the operational and capital cost of SIP/IP-based interconnection. In addition, there is no commonly-agreed methodology on how to translate phone numbers for routing data for SIP-IP interconnection.

The Alliance for Telecommunications Solutions (ATIS) and the SIP Forum formed a Joint Network-to-Network Interface Task Force to fully specify an IP communications network-to-network interface between North American service providers. The Joint Task Force will enable the goal, identified in the United States National Broadband Plan, of ensuring all service interconnection between providers occur at the Internet Protocol (IP) level. By enabling ubiquitous IP-based interconnection, the Task Force supports wide-scale availability of IP-based voice services, and for laying the groundwork for ubiquitous advanced real-time communications such as high-definition voice, point-to-point video calling, and multimedia text across wireless, wireline and cable providers.



How to Join the Effort

Participation in the ATIS/SIP Forum Joint Task Force is currently open to ATIS and/or SIP Forum members.

To join the effort, you must already be an Individual "Participant" Member of the SIP Forum. This membership is completely FREE.

If you are not yet a Participant Member, Please Register HERE. (Note: This link will take you to a quick and easy online form).

Once you are registered, please visit the NNI Task Group Charter page HERE.

At the top of the charter page, you will find a link to subscribe to the NNI TF Mailing List.



NNI Task Force Documentation

The following documents produced by the NNI Task Force are available for download:

1. Signature-based Handling of Asserted information using toKENs (SHAKEN)

This is the PDF version of the ratified NNI Task Force "SHAKEN" document. Signature-based Handling of Asserted information using toKENs (SHAKEN) is an industry framework for managing the deployment of Secure Telephone Identity (STI) technologies with the purpose of providing end-to-end cryptographic authentication and verification of the telephone identity and other information in an IP-based service provider voice network. This specification defines the framework for telephone service providers to create signatures in SIP and validate initiators of signatures. It defines the various classes of signers and how the verification of a signature can be used towards the mitigation and identification of illegitimate use of national telecommunications infrastructure and to protect its users.


2. Joint ATIS/SIP FORUM Technical Report – IP NNI Profile

This is the ratified version of the IP NNI Profile Specification, published by the joint ATIS/SIP Forum NNI Task Force. The IP-NNI Profile Specification defines a reference architecture and specifications for both the protocol and media as it appears “on-the-wire” at interconnect points. The specifications reference commonly used IETF, 3GPP, and other related industry specifications and identify protocol extensions and capability information needed for all-IP telephony peering.


3. Joint ATIS/SIP Forum Technical Report - IP Interconnection Routing

This is the ratified version of the IP Interconnection Routing Report, published by the joint ATIS/SIP Forum NNI Task Force. The IP-NNI Routing Technical Report documents mechanisms for identifying the preferred IP interconnection point for a given TN. This report presents multiple views of current IP interconnection mechanisms based on aggregate PSTN constructs, interim solutions based on all-IP routing using a per-TN registry, and a consideration of hybrid approaches across both mechanisms during the transition to all-IP.



Robocall Strike Force Documents and Information

Robocalls and telemarketing calls are currently the number one source of consumer complaints at the FCC.What was once a nuisance has become a plague to U.S consumers receiving an estimated 2.4 billion robocalls per month in 2016.

The FCC has been encouraging service providers to offer call blocking solutions that give customers greater control over the types of calls they receive. Call blocking is one part of the robocall solution. Another part is identifying the bad actors who use robocalls to take advantage of unsuspecting consumers by using numbers assigned to others (spoofing). They use cheap and accessible technologies to spoof their caller identity and scam victims with threats from the IRS, offers of loans, or free travel. The Strike Force is committed to protecting customers, but these disguised calls have put investigators and enforcers at a disadvantage.

Although several providers and third parties offer call blocking and caller identification verification products, there is no ubiquitous solution that spans wireline and wireless communication networks. The industry has been called to action by the Robocall Strike Force to collaborate on creative solutions to this ever changing problem.

The mission of the cross industry Strike Force is to accelerate the development and adoption of new tools and solutions to abate the proliferation of illegal and unwanted robocalls, to promote greater consumer control over the calls they wish to receive, and to make recommendations to the FCC on the role government can play in this battle.

The following documents and information related to the Robocall Strike Force include:



For More Information

For more information about the NNI Task Force, and the work in progress, please visit the NNI TF Charter Page or contact Marc Robins, SIP Forum President and Managing Director, at marc.robins "at" sipforum.org.

You can also access previous Task Group announcements as follows:



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