RFC 3261, "SIP: Session Initiation Protocol", June 2002

Errata ID: 832
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT
Reported By: Marco Ambu
Date Reported: 2006-01-11
Held for Document Update by: Robert Sparks

I would like to show you an ambiguity in RFC 3261.

The ABNF for SIP in RFC 3261 page 227 defines header Accept as 
"Accept = "Accept" HCOLON [accept-range *(COMMA accept-range)].

Expanding this form we have:

Accept = "Accept" HCOLON [( (...) *(SEMI m-parameter) *(SEMI 
accept-param) ) *(COMMA accept-range)]

For example we can have

Accept: 
application/sdp;m_extension_parameter=value1;accept_extension_param=value2;q=0.5
We know from RFC 3261 that q is an accept-param.
We don't know how to consider the first two unknown parameters: how to 
distinguish from m-parameter and accept-param?

While in other cases RFC 3261 shows the rules to solve ambiguities (for 
example how to consider the parameters in a Contact URI if the URI is 
not enclosed in angular brackets) I have not found any suggestion for 
this specific case in RFC 3261.

It should say:

[not submitted]

Notes:

from pending

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