Application context name

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[Maddy]

HI All,
What is Application Context Name in ss7 MAp ?

Thanks

Maddy

[pramod]

Hi Maddy
Application Context comes under dialogue portion of TCAP msg
Where it specifies about the msg Version and type .

[dineshonss7]

Its 8 byte value used to negotiate the service capabality and version supported between MAP users.

First 6 byte will be almost fixed for all MAP operation code.

byte[0] = 00  /* CCITT */
byte[1] = 04  /* Identified organazation */
byte[2] = 00  /* ETSI */
byte[3] = 00  /* Mobile Domain */
byte[4] = 01  /* GSM Network */
byte[5] = 00  /* AC Id */

Last two byte differs according to MAP operation code and version supported by MAP layer.
Sixth byte takes value defined in MAP spec according to operation code which MAP user wants to negotiate with peer.
Seventh byte contains version supported for that message (operation code).
byte[6] =  18  /* Network Functional Ss -- example value */
byte[7] =   2  /* supported version 2 */

NOTE :- Network Functional Ss conext value is defined for REGISTER SS operation code.