4.2 Sleep Mode Commands............................................................................................................................ 35
4.2.1 S24, Set Number of Seconds Delay Before Module Enters Sleep Mode..............................35
4.3 Error Handling Commands........................................................................................................................ 36
4.3.1 +CMEE, Report Mobile Equipment Error.................................................................................... 36
4.3.2 +CEER, Extended Error Report.................................................................................................... 37
4.4 +MSTART, Start message notification.....................................................................................................38
5 Call Control.............................................................................................................................................................. 39
5.1 Call Control AT Commands....................................................................................................................... 39
5.1.1 D, Dial Command............................................................................................................................ 39
5.1.2 D>, Direct Dialing from Phone Books.......................................................................................... 40
5.1.3 DL, Dial Last Number......................................................................................................................41
5.1.4 H, Hang-up Call................................................................................................................................42
5.1.5 A, Answer Incoming Call.................................................................................................................43
5.1.6 +CRC, Cellular Result Codes and RING, +CRING - Incoming Call Indication.....................44
5.1.7 +CLIP, Calling Line Identification.................................................................................................. 46
5.1.8 +CLIP Indication...............................................................................................................................46
5.1.9 +CCWA, Call Waiting Command.................................................................................................. 48
5.1.10 +CCWA Indication......................................................................................................................... 49
5.1.11 +CHLD, Call Related Supplementary Services Command.................................................... 51
5.1.12 +CCFC, Call Forwarding Number and Conditions.................................................................. 53
5.1.13 +CLIR, Calling Line Identification Restriction........................................................................... 56
5.1.14 O, Return to Online Data State................................................................................................... 58
5.1.15 +CHUP, Hang up Call................................................................................................................... 59
5.1.16 +MDC, Selection of Desired Message to Be Displayed Upon Connection of a Voice Call59
5.1.17 +MHUP, Module Hung UP call.................................................................................................... 60
5.2 Call Status Messages.................................................................................................................................61
5.2.1 +CPAS, Phone Activity Status....................................................................................................... 61
5.2.2 +CLCC, List Current Calls..............................................................................................................62
5.3 Supplementary Services............................................................................................................................ 65
5.3.1 +CSSN, Supplementary Service Notifications............................................................................65
5.3.2 +CUSD, Unstructured Supplementary Service Data.................................................................68
5.3.3 +COLP, Connected Line Identification Presentation................................................................. 73
6 Phone and Date Books and Clock.......................................................................................................................75
6.1 Directory Access Commands - Phone Book.......................................................................................... 75
6.1.1 +CPBS, Select Phone Book Memory...........................................................................................75
6.1.2 This command handles the selection of the memory to be used for reading and writing
entries in the Moduleās phone bookās memory..................................................................................... 75
6.1.3 +CPBR, Read Phone Book Entries.............................................................................................. 76
6.1.4 +CPBF, Find Phone Book Entries.................................................................................................78