Multi-tech-systems MMCModem GPRS (MTMMC-G) Manual de usuario Pagina 87
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Chapter 10 – Supplementary Services Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 87
Call Related Supplementary Services +CHLD
Description: This command manages call hold and multiparty conversation (conference call). Calls can be put on
hold, recovered, released or added to a conversation.
Values: <n>
0 Release all held calls or set User Determined User Busy (UDUB) for a waiting call.
1 Release all active calls (if any exist) and accepts the other (held or waiting) call.
1x Release a specific call X (active, held or waiting)
2 Place all active calls (if any exist) on hold and accepts the other (held or waiting) call.
2x Place all active calls on hold except call X with which communication is supported.
3 Adds a held call to the conversation.
4 Connects the two calls and disconnects the subscriber from both calls (Explicit Call Transfer).
Syntax: Command syntax: AT+CHLD=< n >
Command Possible responses
AT+CHLD=<n> OK
Note: If n is within the defined values
AT+CHLD=? +CHLD: (0-4, 11-17, 21-27)
OK
- Wireless GSM/GPRS Modems 1
- Contents 3
- Chapter 1 – Introduction 9
- Chapter 2 – AT Command 10
- Features 10
- Background Initialization 11
- Chapter 4 – General AT 13
- Request IMSI +CIMI 15
- Card Identification +CCID 15
- Capabilities List +GCAP 15
- Repeat Last Command A/ 15
- Power Off +CPOF 16
- Keypad Control +CKPD 17
- Clock Management +CCLK 18
- Alarm Management +CALA 18
- Chapter 5 – Call Control 19
- Hang-Up Command H 20
- Answer a Call A 21
- Remote Disconnection 21
- DTMF Signals +VTD, +VTS 21
- Automatic Answer S0 23
- Incoming Call Bearer +CICB 24
- Gain Control +VGR, +VGT 24
- Echo Cancellation +ECHO 27
- Chapter 6 – Network Service 31
- Network Registration +CREG 33
- Read Operator Name +WOPN 34
- Read Operator Name +COPN 39
- Chapter 7 – Security 40
- Enter PIN2 +CPIN2 42
- Facility Lock +CLCK 43
- Change Password +CPWD 44
- Chapter 8 – Phonebook 45
- Subscriber Number +CNUM 55
- Set Voice Mail Number +CSVM 56
- Contact Selector +WCOS 57
- Chapter 9 – Short Messages 60
- Save Settings +CSAS 65
- Restore Settings +CRES 65
- Read Message +CMGR 68
- List Message +CMGL 69
- Send Message +CMGS 70
- Delete Message +CMGD 73
- Message Overwriting +WMGO 76
- Copy Messages +WMCP 78
- Chapter 10 – Supplementary 80
- Services Commands 80
- Call Barring +CLCK 81
- Modify SS Password +CPWD 81
- Call Waiting +CCWA 82
- Advice of Charge +CAOC 85
- List Current Calls +CLCC 88
- Closed User Group +CCUG 91
- Chapter 11 – Data Commands 92
- Select Mode +FCLASS 94
- Select Data Compression %C 97
- Chapter 12 – V.24 and V.25 99
- Set DCD Signal &C 101
- Set DTR Signal &D 102
- Set DSR Signal &S 102
- Back to Online Mode O 102
- Result Code Suppression Q 102
- Default Configuration Z 103
- Save Configuration &W 103
- DCE Response Format V 103
- Auto-Tests &T 104
- Echo E 104
- Multiplexing Mode +WMUX 106
- Chapter 13 – Specific AT 107
- Commands 107
- General Indications +WIND 109
- 0 1 2 3 4 112
- 5 6 7 8 9 112
- 10 11 12 13 14 112
- 15 16 17 18 19 112
- 20 21 22 23 24 112
- Read GPIO Value +WIOR 114
- Write GPIO Value +WIOW 114
- Abort Command +WAC 116
- Play Tone +WTONE 117
- Play DTMF Tone +WDTMF 118
- Downloading +WDWL 118
- Voice Rate +WVR 119
- Data Rate +WDR 120
- Select Voice Gain +WSVG 121
- Status Request +WSTR 121
- Scan +WSCAN 122
- Ring Indicator Mode +WRIM 122
- Custom Character Set +WCCS 124
- Lock +WLCK 125
- CPHS Command +CPHS 126
- CPHS Information +WCPI 129
- Change Default Player +WCDP 130
- CPHS Mail Box Number +WMBN 131
- Reset +WRST 135
- Set Standard Tone +WSST 135
- Hang-up +WATH 136
- Multi-Band Selection +WMBS 137
- Chapter 14 – SIM Toolkit 138
- +STSF=X,XXXXXXXX 139
- SIM Toolkit Commands 140
- Example 141
- Chapter 15 – GPRS commands 149
- +CGQMIN 154
- Enter Data State +CGDATA 157
- Request GPRS IP Service D 162
- Context Activation +CGAUTO 164
- Context Activation +CGANS 165
- Show PDP Address +CGPADDR 166
- Cellular Result Codes +CRC 166
- Example 1 170
- Example 2 170
- Network Request 170
- Chapter 16 – Other AT 171
- Appendix A – Result Codes 172
- Failure Causes, Other Tables 172
- Specific Error Result Codes 174
- Unsolicited Result Codes 179
- Final Result Codes 179
- Intermediate Result Codes 179
- Parameter Storage Mode 180
- GSM Sequences List 182
- Call Barring 183
- Call Waiting 183
- Number Presentation 183
- Operator Names 183
- CPHS Information Field 184
- CSP Constants 185
- Appendix B - ME SIM Toolkit 187
- Support 187
- Terminal Profile 188
- Appendix D – Command Type 190
- Appendix E – Coding of Alpha 191
- Appendix F – Command 193
- Execution and Dependence on 193
- Network Service Commands 194
- Security Commands 194
- Phonebook Commands 194
- Short Messages Commands 194
- Data Commands 195
- V24-V25 Commands 195
- Specific AT Commands 196
- GPRS Commands 197
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