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Simple Protocol for Inviting Numbers (SPIN)

Document Type Expired Internet-Draft (individual)
Expired & archived
Authors Jonathan Rosenberg , Cullen Fluffy Jennings , Alissa Cooper , Jon Peterson
Last updated 2023-04-27 (Latest revision 2022-10-24)
Replaces draft-rosenberg-dispatch-spin
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


This document introduces a framework and a protocol for facilitating voice, video and messaging interoperability between application providers. This work is motivated by the recent passage of regulation in the European Union - the Digital Markets Act (DMA) - which, amongst many other provisions, requires that vendors of applications with a large number of users enable interoperability with applications made by other vendors. While such interoperability is broadly present within the public switched telephone network, it is not yet commonplace between over-the-top applications, such as Facetime, WhatsApp, and Facebook Messenger. This document specifically defines the Simple Protocol for Inviting Numbers (SPIN) which is used to deliver invitations to mobile phone numbers that can bootstrap subsequent communications over the Internet.


Jonathan Rosenberg
Cullen Fluffy Jennings
Alissa Cooper
Jon Peterson

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)