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RFC 3264, "An Offer/Answer Model with Session Description Protocol (SDP)", June 2002

Source of RFC: mmusic (rai)

Errata ID: 2098
Status: Held for Document Update
Type: Technical

Reported By: Parveen Verma
Date Reported: 2010-03-30
Held for Document Update by: Robert Sparks

Section 10 says:

10.1 Basic Exchange

   Assume that the caller, Alice, has included the following description
   in her offer.  It includes a bidirectional audio stream and two
   bidirectional video streams, using H.261 (payload type 31) and MPEG
   (payload type 32).  The offered SDP is:

   v=0
   o=alice 2890844526 2890844526 IN IP4 host.anywhere.com
   s=
   c=IN IP4 host.anywhere.com
   t=0 0
   m=audio 49170 RTP/AVP 0
   a=rtpmap:0 PCMU/8000
   m=video 51372 RTP/AVP 31
   a=rtpmap:31 H261/90000
   m=video 53000 RTP/AVP 32
   a=rtpmap:32 MPV/90000

It should say:

10.1 Basic Exchange

   Assume that the caller, Alice, has included the following description
   in her offer.  It includes a bidirectional audio stream and two
   bidirectional video streams, using H.261 (payload type 31) and MPEG
   (payload type 32).  The offered SDP is:

   v=0
   o=alice 2890844526 2890844526 IN IP4 host.anywhere.com
   s=-
   c=IN IP4 host.anywhere.com
   t=0 0
   m=audio 49170 RTP/AVP 0
   a=rtpmap:0 PCMU/8000
   m=video 51372 RTP/AVP 31
   a=rtpmap:31 H261/90000
   m=video 53000 RTP/AVP 32
   a=rtpmap:32 MPV/90000

Notes:

The s= session name must have some values as per RFC 4566 Sec 5.3.
----------------------------------------------------------------
RFC 4566
5.3. Session Name ("s=")

s=<session name>

The "s=" field is the textual session name. There MUST be one and
only one "s=" field per session description. The "s=" field MUST NOT
be empty and SHOULD contain ISO 10646 characters (but see also the
"a=charset" attribute). If a session has no meaningful name, the
value "s= " SHOULD be used (i.e., a single space as the session name).
----------------------------------------------------------------
RFC 3264 also states in Section 5
"Unfortunately, SDP does not allow the "s=" line to be empty."

Even if we put "s= " , it becomes a bit difficult to read/understand in soft/printed copy.

The same error applies to all SDP examples given in Section 10

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