The IESG has approved the following document: - 'A SIP Response Code for Unwanted Calls' (draft-ietf-sipcore-status-unwanted-06.txt) as Proposed Standard This document is the product of the Session Initiation Protocol Core Working Group. The IESG contact persons are Adam Roach, Alexey Melnikov and Ben Campbell. A URL of this Internet Draft is: https://datatracker.ietf.org/doc/draft-ietf-sipcore-status-unwanted/ Technical Summary This document defines the 607 (Unwanted) SIP response code, allowing called parties to indicate that the call or message was unwanted. SIP entities may use this information to adjust how future calls from this calling party are handled for the called party or more broadly. This is part of the larger toolkit of SIP tools being developed to help mitigate the issue of large-scale unwanted phone calls. Working Group Summary The period of discussion for this draft was uncharacteristically short and vigorous for the SIPCORE working group, with over 150 messages spanning a three-month period. Support for the mechanism was universal, with the only real point of contention being how far the document should go in prescribing specific behaviors by network elements upon receipt of the response code. The current version reflects carefully crafted wording that reflects the intention of the code while avoiding the concerns of those parties that did not want to see future call-rejection behavior normatively defined. This draft originally defined the response code to be 666. The working group decided to change that to 607 after objections to 666 were raised during IETF LC. Document Quality The document has been well reviewed within the SIP working group. While no implementations are known to yet exist, the need for this new response code has been brought to the IETF by the United States FCC and major US telecommunications carriers as a necessary tool for fighting unwanted phone calls. There is a strong implication that these parties plan to ensure a wide-scale roll-out of the response code, at least within the United States, and likely elsewhere. Personnel Adam Roach is the document shepherd. Ben Campbell is the responsible area director.
