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Status: Reported (1)

RFC 8864, "Negotiation Data Channels Using the Session Description Protocol (SDP)", January 2021

Source of RFC: mmusic (art)

Errata ID: 7805
Status: Reported
Type: Technical
Publication Format(s) : HTML

Reported By: Harald Alvestrand
Date Reported: 2024-02-09

Section 6.1 says:

   In order to avoid SCTP Stream identifier collisions, in alignment
   with [RFC8832], the endpoint acting as a DTLS client (for the SCTP
   association used to realize data channels) MUST use even identifier
   values, and the endpoint acting as a DTLS server MUST use odd
   identifier values.

It should say:

[RFC8831] does not restrict the SCTP Stream identifiers for data
channels negotiated out-of-band. The endpoints are free to assign
any numbers to the negotiated data channels; collisions are handled
by the usual mechanisms used to avoid SDP signalling glare.


The procedures of [RFC8832] are inappropriate in this case, because DCMAP indicates channels negotiated out-of-band and not via DCEP.

At initial offer, the DTLS direction attribute is ACTPASS, so the direction is not known. Thus, the RFC 8832 numbering rule is impossible to apply anyway.

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