Friday, 27 June 2014

GSM Services




GSM Services


GSM Services are divided into three categories:-
1. Teleservices.
2. Bearer services.
3. Supplementary services.








             1. Teleservices provide:-

 Speech transmission-telephony
 Emergency call.
 Short message service.
 Videotext access.
 Teletext transmission.
 Facsimile transmission.

2. Bearer services :-

                   Data services 
                   Speech and data swapping during a call.
                  •  Modem selection.

3. Supplementary services:-


       i.  Call Completion Services like -
                  Call Waiting (CW).
                  Call Holding (HOLD).
                  Completion of Call to Busy Subscriber (CCBS).

       ii. Calling Offering services like -
                  Call Forwarding Unconditional (CFU).
                  Call Forwarding Mobile Busy (CFB).
                  Call Forwarding No Reply (CFNRy).
                 •  Call Forwarding Mobile Not Reachable (CFNRc).
                 •  Mobile Access Hunting (MAH).

     iii. Number Identification services like -
                 Calling Number Identification Presentation (CNIP).
                 Calling Number Identification Restriction (CNIR).
                 Connected Number Identification Presentation (CNOP).
                 Connected Number Identification Restriction (CNOR).

    iv. Multiparty Services like -
                • Conference Calling (CONF)

    v. Call Restriction Services like-
                 Barring All Originated Calls (BAOC).
                 Barring Outgoing International Calls (BOIC).
                 BOIC except Home Country (BOIC-exHC).
                Barring All Incoming Calls (BAIC).
                 Barring Incoming calls when Roaming (BIC-Roam).

   vi. Charging Services like -
                Advice of Charge (AoC).
                Free Phone Service (FPH).
                 Reverse Charging (REVC).