Section 2. SIP Uniform Resource Locators:

    delete

    <  tag-param       = "tag=" UUID
    <  UUID            = 1*( HEX | "-" )

    or replace with

    >  tag-param       =  "tag=" token

    and delete same from Section 6.24 From:

        Section 6.24 From:
            from-param  =  tag-param | generic-param
        <   tag-param   =  "tag" "=" token

        Section 6.43 To:
            to-param  =  tag-param | generic-param

In Section 3 SIP Message Overview:

    add Call-Info header lines to general-header syntax:

        general-header   =  Accept               ; Section 6.6
                         |  Accept-Encoding      ; Section 6.7
                         |  Accept-Language      ; Section 6.8
                         |  Call-ID              ; Section 6.12
    >                    |  Call-Info            ; Section 6.13
                         |  Contact              ; Section 6.14
                         |  CSeq                 ; Section 6.20

In Section 4.1 Request-Line:

    absoluteURI should be defined or reference [RFC2068] Section 3.2.1.

In Section 4.3.1 SIP Version:

    add ABNF:

    >  SIP-Version = "SIP/2.0"

In Section 6.13 Call-Info:

    <  Call-Info   =  "Call-Info" ":" # ( "<" URI ">" *( ";" info-param )

    has imbalanced parentheses and should be changed to:

    >  Call-Info   =  "Call-Info" ":" # ( "<" URI ">" *( ";" info-param ) )

In Section 6.14 Contact:

    qvalue should be defined here or RFC2068 Section 3.9 referenced.
    delta-seconds should be defined here or RFC2068 Section 3.3.2 referenced.

In Section 6.16 Content-Encoding:

    <  tokens. See [3.5] for a definition of the syntax for content-coding.

    should read

    >  tokens. See [H3.5] for a definition of the syntax for content-coding.

In Section 6.17 Content-Language:

    <  See [H14.12]

    should be changed to 

    >  See [H14.13]

In Section 6.21 Date:

    <  See [H14.18] for a definition of rfc1123-date. Note that unlike

    should read

    >  See [H14.19] for a definition of rfc1123-date. Note that unlike

In Section 6.28 MIME-Version:

    <  See [H19.4.1].

    should read

    >  See [H19.4.7].

In Section 6.30 Priority:

    <  other-priority     token

    is missing a definedas and should be changed to:

    >  other-priority  =  token

In Section 6.31 Proxy-Authenticate:

    should reference [H14.32] for ABNF syntax.

In Section 6.32 Proxy-Authenticate:

    should reference [H14.33] for ABNF syntax.

In Section 6.33 Proxy-Require:

    add following syntax definition:

    >  Proxy-Require = "Proxy-Require" ":" 1#option-tag

In Section 6.39 Server:

    <  syntax for this field is defined in [H14.38].

    should be

    >  syntax for this field is defined in [H14.39].

In Section 6.46.6 [Via] Syntax:

    maddr is never defined.

    ttl is redefined from Section 2: SIP Uniform Resource Locators: delete

    <  ttl              = 1*3DIGIT     ; 0 to 255

In Section 6.47 Warning:

    pseudonym should be defined here or RFC2068 Section 14.44 referenced.

In Section 15.1.1 The WWW-Authenticate Response Header:

    <  pgp-version       =  "version" "="
    <                       <"> digit *( "." digit ) *letter <">

    should read

    >  pgp-version       =  "version" "="
    >                       <"> digit *( "." digit ) *alpha <">

In Section 15.2 and 15.3:

    pgp-eparams is defined twice; suggest:

    <  Response-Key  =  "Response-Key" ":" "pgp" pgp-eparams
    <  pgp-eparams   =  1# ( pgp-version | pgp-encoding | pgp-key)

    replaced with 

    >  Response-Key  =  "Response-Key" ":" "pgp" pgp-ekparams
    >  pgp-ekparams   =  1# ( pgp-version | pgp-encoding | pgp-key)

In Section C.1 Basic Rules:

    <  CTL       =  %x00-1f | 0x7f ; (octets 0 -- 31) and DEL (127)

    should read

    >  CTL       =  %x00-1f | %x7f ; (octets 0 -- 31) and DEL (127)