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RFC 3711, "The Secure Real-time Transport Protocol (SRTP)", March 2004

Source of RFC: avt (rai)

Errata ID: 4425
Status: Held for Document Update
Type: Editorial
Publication Format(s) : TEXT

Reported By: Ross Finlayson
Date Reported: 2015-07-22
Held for Document Update by: Ben Campbell
Date Held: 2016-04-13

Section 3.4 says:

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<+
     |V=2|P|    RC   |   PT=SR or RR   |             length          | |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |

It should say:

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<+
     |V=2|P|    RC   |   PT=SR or RR |             length          | |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |

Notes:

The boundary between the "PT=SR or RR" and the "length" fields is wrong: The boundary is shown as being between bits 16 and 17; it should be between bits 15 and 16. I.e., the "PT=SR or RR" field should be 8 bits long, not 9.

This is just a minor bug, because the equivalent diagram in RFC 3550 (the normative reference for RTCP) is correct. Nonetheless, this bug should probably be added to the errata for RFC 3711

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