[SIPForum-discussion] "100 REL" vs "100 rel"

[Oscar Alonso Sánchez Hernández]

 Dear all.
I find no reason to say that *100REL* is incorrect
I understand that both *100REL* and *100rel* are correct expresions, i.e.,
the grammar for parameter values is case-insensitive and the RFC3262 does
not mention any contrary rule for grammar for parameter names and parameter
values wich is defined in RFC3261, except, for RAck header (wich is
case-sensitive)

[RFC3261, pag 30]

   When comparing header fields, field names are always case-
   insensitive.  Unless otherwise stated in the definition of a
   particular header field, field values, parameter names, and parameter
   values are case-insensitive.  Tokens are always case-insensitive.
   Unless specified otherwise, values expressed as quoted strings are
   case-sensitive.  For example,
      Contact: <sip:alice at atlanta.com <sip%3Aalice at atlanta.com>
>;expires=3600
   is equivalent to
      CONTACT: <sip:alice at atlanta.com <sip%3Aalice at atlanta.com>
>;ExPiReS=3600
   and
      Content-Disposition: session;handling=optional
   is equivalent to
      content-disposition: Session;HANDLING=OPTIONAL
   The following two header fields are not equivalent:
      Warning: 370 devnull "Choose a bigger pipe"
      Warning: 370 devnull "CHOOSE A BIGGER PIPE"
Regards,

Oscar Alonso Sánchez Hernández

2009/5/29 nitin kapoor <nitinkapoorr at gmail.com>

> Hello Chesser,
>
> There is no OPTION Tag with the name of 100REL, there is only OPTION Tag
> with the name of "*100rel*" and we are using this option tag is for
> reliability of provisional responses.  When present in a Supported header,
> it indicates that the UA can send or receive reliable provisional
> responses.When present in a Require header in a request, it indicates that
> the UAS MUST send all provisional responses reliably.When present in a
> Require header in a reliable provisional response, it indicates that the
> response is to be sent reliably.
>
> Please refer to rfc 3261 and 3262 for more info.
>
> Thanks,
> Nitin Kapoor
> General Telecom
>
>
> 2009/5/28 chesser domingo <chesnet at yahoo.com>
>
>
>> Hello to everybody...
>>
>> Kindly help me with the difference between "100 REL" and "100 rel".
>>
>> We have a ZTE ZXSS SS1a/b soft switch and a SIP trunk interconnection with
>> a Nortel CS1000 PBX. On the SUPPORTED header of the Invite from ZTE, it
>> places "100 REL". On the other hand, the supported header from the Nortel
>> CS1000 indicates a "100 rel". IS there a chance that the ZTE soft switch
>> does not accept the "100 rel" from the Nortel PBX?
>>
>> Kind Regards,
>>
>> Chesser Domingo
>>
>>
>>
>>
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>
>
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-- 
Oscar Alonso Sánchez Hernández
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