>> Discar message.

...or send 400 Bad Request.

21.4.1 400 Bad Request

   The request could not be understood due to malformed syntax.  The
   Reason-Phrase SHOULD identify the syntax problem in more detail, for
   example, "Missing Call-ID header field".


And using the 400 response will stop the request originator from
retransmitting their request.

Regards,

Attila

Attila Sipos
http://www.vegastream.com



>> -----Original Message-----
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] Behalf Of Voipers
>> Portugal
>> Sent: 22 March 2006 14:16
>> To: Szabo, Barna
>> Cc: [email protected]
>> Subject: Re: [Sip-implementors] Contact header missing in INVITE
>> 
>> 
>> Discar message.
>> 
>> Jose Simoes
>> 
>> 
>> On 3/22/06, Szabo, Barna <[EMAIL PROTECTED]> wrote:
>> >
>> > Hallo,
>> > in the INVITE the Contact header is mandatory, but I 
>> didn't found any
>> > request, what shall do the server transaction if mising.
>> > What is Your opinion?
>> > regards
>> > Barna
>> > _______________________________________________
>> > Sip-implementors mailing list
>> > [email protected]
>> > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
>> >
>> _______________________________________________
>> Sip-implementors mailing list
>> [email protected]
>> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
>> 

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