Title: CM - Reception of a D-START indication with no version number
PDR Reference:                          M2050001
Originator Reference:                   -
SARPs Document Reference:               CM SARPs, 2.1.5.3.3.2
Status:                                 REJECTED
Impact:					     -
PDR Revision Date:                      04/10/02 (ACCEPTED -> REJECTED)
					28/08/02 (SUBMITTED -> ACCEPTED)
PDR Submission Date:                    24/05/02
Submitting State/Organization:          AIRBUS France
Submitting Author Name:                 L. Emberger 
Submitting Author E-mail Address:       luc.emberger@airbus.com 
Submitting Author Supplemental
Contact Information:
SARPs Date:                             ICAO 9705 Editions 2 and 3
SARPs Language:                         English
     
Summary of Defect:
     
The exception case where the CM-air-ASE (CM-logon-req) or the CM-ground-ase (CM-forward-req) sends by error a D-START request without specifying the version number (this parameter is not to be used by the other applications) is not described in the SARPs. 

It should be clearly stated that upon receipt of a D-START indication with no Version Number parameter, the CM-ground-ASE shall refuse the dialogue establishment with an abort. 

Assigned SME:                      	SV2 SME

Proposed SARPs Amendment:

It is true that this case is not explicitly described. 

However, sections 2.1.5.3.3.2.1.1/2/3 and 2.1.5.3.3.2.2.1/2/3 force the CM-ground-ASE to compare the value received in the D-START indication DS User version number with the version number of the ground ASE. This implies that it is assumed that the D-START indication primitive contains a version number parameter.

Therefore the general exception handling section 2.1.5.4.4.3 is fully applicable "upon receipt of a dialogue service primitive for which there are no instruction in 2.1.5.3 (i.e. the primitive [...] was expected with other parameter values)".

The SARPs covers the case described in this PDR by instructing the CM-ground-ASE to abort the connection with reason "protocol-error".

No change to the SARPs is proposed.

Impact on Interoperability:  

PDR Validation Status:			
       
SME Recommendation to CCB:		
     
CCB Decision:				CCB-16 (Toulouse): REJECTED