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.