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Liaison statement
Re: ATIS White Paper on Calling Party Anti Spoofing

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State Posted
Submitted Date 2016-04-22
From Group ATIS
From Contact Susan Miller
To Group stir
To Contacts Robert Sparks <>
Russ Housley <>
Cc Russ Housley <>
Ben Campbell <>
Alissa Cooper <>
Robert Sparks <>
Alexey Melnikov <>
Secure Telephone Identity Revisited Discussion List <>
Purpose For information
Attachments Re: ATIS White Paper on Calling Party Anti Spoofing
Dear Mr. Housley:
On behalf of the Alliance for Telecommunications Industry Solutions (ATIS), I
am pleased to announce the publication of ATIS’ White Paper on Calling Party
Spoofing Mechanisms and Mitigation Techniques. This white paper provides
information on caller ID spoofing mitigation techniques and is available via
the ATIS White Paper Library at:

Both existing and proposed caller ID mitigation techniques are examined,
including technical specifications and standards that would allow phone numbers
to be “signed” at the origin and “verified” at the termination. The paper
concludes that Caller ID spoofing is not a problem that can be fixed with a
single solution and, as an alternative, proposes a layered approach, similar to
that used in cybersecurity efforts.

This white paper is just one of several ATIS work programs aimed at examining
and mitigating challenges associated with caller ID spoofing. Other relevant
work is being completed in ATIS’ Next Generation Interconnection
Interoperability Forum (NGIIF), which has recently published its Next
Generation Network (NGN) Reference Document, outlining Caller ID issues and
their impacts to consumers and to the network. The ATIS Packet Technologies and
Systems Committee (PTSC) is working on a Technical Report on Originating Party
Spoofing in IP Communication Networks. Additionally, ATIS is working with the
SIP Forum on proposed enhancements to Secure Telephone Identity Revisited
(STIR). We would be happy to provide further information on its Caller ID
spoofing mitigation work programs.

If you have any questions or would like further information, please do not
hesitate to contact me at or (202) 434-8828.

Susan Miller
President and CEO