Re: RFC 3868 query regarding sequence number

Sujay,

when a CODT does not have Sequence Number, then it represents ED.
DT1 may not be represented by a CODT without Sequence Number.

This is what is meant by this implementation note.

Regards,
Sergey Mikhailov.

  ----- Original Message ----- 
  From: Sujay Udupa 
  To: [email protected] 
  Sent: Tuesday, May 19, 2009 8:40 PM
  Subject: [Sigtran] RFC 3868 query regarding sequence number


  Hi All,

   

I have a query regarding section 3.3.1 in RFC 3868 3.3.1.  Connection Oriented Data Transfer (CODT)......   |         Tag = 0x0107          |             Length            |   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+   |                        Sequence Number                        |......     Parameters     Routing Context               Mandatory     Sequence Number               Optional *1......   NOTE *1:   This parameter is not present in case of Expedited Data              (ED).    Implementation note: For the CODT to represent DT1, DT2 and ED   messages, the following conditions MUST be met:    DT1 is represented by a CODT when:     Sequence Number parameter is present (contains "more" indicator).    DT2 is represented by a CODT when:     Sequence Number parameter is present (contains P(S), P(R) and more     indicator)    ED is represented by a CODT with:     Sequence Number parameter is not present Here Sequence number is mentioned as a optional parameter. Can one assume that is a message is received without a sequence number, then the message is Expedited? Can a DT1 message not have a sequence number? Thanks,Sujay  



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