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9.8 AT+CHLD Call Hold and Multiparty Description: Test Command Syntax: AT+CHLD= Response: Chapter 9 – Supplementary Service Commands TA controls the Supplementary Services Call Hold and Multiparty. Calls can be put on hold, recovered, released, and added to a conversation. As for all Supplementary Services, the availability and detailed functionality of Call Hold and Multiparty services depends on the configuration of the GSM network. The Multi-Tech wireless modem can only request the service, but the network decides whether and how the request will be answered. +CHLD: (list of supported s) OK Write Command Syntax: AT+CHLD=[] Response: OK ERROR +CME ERROR: Parameter Descriptions: 0 Release all held calls or set User Determined User Busy (UDUB) for a waiting call: • If a call is waiting, release the waiting call. The calling party will receive a “BUSY” indication (Supplementary Service User Determined User Busy “UDUB”) • Otherwise, terminate all held calls (if any). 1 Terminate all active calls (if any) and accept “the other call” as the active call: • If a call is waiting, the waiting call will be accepted. • Otherwise, if a held call is present, the held call becomes active. 1X Terminate a specific call X (X= 1-7). The call may be active, held or waiting. The remote party of the terminated call will receive a “NO CARRIER” indication. Parameter X is the call number of the targeted call in the list of current calls available with AT command AT+CLCC. 2 Place all active calls on hold (if any) and accept “the other call” as the active call: • If a call is waiting, the waiting call will be accepted. • Otherwise, if a held call is present, the held call becomes active. 2X Place all active calls except call X (X= 1-7) on hold. Parameter X is the call number of the targeted call in the list of current calls available with AT command AT+CLCC. 3 Add a held call to the active calls in order to set up a conference (multiparty) call. Notes: • The AT+CHLD command offers a broad range of options according to the GSM specifications. However, if you attempt to invoke an option which is not provisioned by the network, or not subscribed to, invocation of this option will fail. The responses in these cases may vary with the network (for example “Operation not allowed”, “Operation not supported” etc.). • The handling of the supplementary service Call hold and Multiparty varies with the types of calls. This is because only voice calls can be put on hold, while data or fax calls cannot. The following procedures apply: With AT+CHLD=2 the user can simultaneously place a voice call on hold and accept another waiting voice, data or fax call. If the waiting call is a data or fax call, it is also possible to put the voice call on hold. To switch back from the active data or fax call to the held voice call the active call must be terminated with AT+CHLD=1. If all active and held calls are voice calls it is possible to switch back and forth with AT+CHLD=2. • In conflict situations (e.g., when a waiting call comes while there are already held calls), the above procedures apply to the waiting call only. For example, =0 rejects the waiting call, but does not affect the held calls. • See also the AT+CCWA command for details on how to display waiting calls. See the Example on the next page. Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371B) 114
Chapter 9 – Supplementary Service Commands Example ^SYSSTART at+cpin=”9999” OK +CREG: 2 +CREG: 1,”0145”,”0016” at+ccwa=1,1,1 OK atd”1234567”; OK +CCWA: “+491791292364”,145,32,,0 at+chld=2 The mobile is now registered. You activate the indication of waiting calls during voice calls. You make a voice call. You receive a URC indicating a waiting data call. You put the voice call on hold. The data connection is set up. CONNECT 9600/RLP hello +++ With “+++” you go in command mode. OK at+clcc +CLCC: 1,0,1,0,0,”03038639268”,129 +CLCC: 2,1,0,1,0,”+491791292364”,145 OK at+chld=1 OK at+clcc +CLCC: 1,0,0,0,0,”03038639268”,129 OK You interrogate the status of all established calls. The active data call is terminated and the held voice call becomes active. Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371B) 115
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Wireless EDGE Modems MultiModem ®
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Table of Contents Table of Contents
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Table of Contents 8.8.1 AT^MONI Res
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Table of Contents 16.5 AT+CPBW Writ
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Chapter 1 - Introduction Chapter 1.
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1.5 Supported Character Sets Chapte
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Chapter 1 - Introduction Figure 1.2
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Chapter 1 - Introduction 1.5.2.2 Im
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Chapter 1 - Introduction For most o
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Chapter 2 - Configuration Commands
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2.5 ATV Set Result Code Format Mode
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3.2 AT+CIND Indicator control Descr
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Chapter 3 - Status Control Commands
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Chapter 4 - Serial Interface Contro
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5.2 AT+CPIN2 PIN2 Authentication Ch
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Page 65 and 66: 5.4 AT+CLCK Facility Lock Chapter 4
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Page 75 and 76: 7.2 ATA Answer a Call Chapter 7 - C
Page 77 and 78: Chapter 7 - Call-Related Commands 7
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Page 93 and 94: Chapter 8 - Network Service Command
Page 107 and 108: Chapter 9 - Supplementary Service C
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Page 117 and 118: 9.10 AT+CLIR Calling Line Identific
Page 121 and 122: Chapter 10 - Internet Service Comma
Page 123 and 124: Write Command Syntax: Response: AT^
Page 143 and 144: Chapter 11 - GPRS Commands Chapter
Page 145 and 146: 11.3 AT+CGATT GPRS Attach or Detach
Page 147 and 148: Chapter 11 - GPRS Commands 11.5 AT+
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Chapter 11 - GPRS Commands 11.21 AT
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Chapter 11 - GPRS Commands AT+CGDAT
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Chapter 12 - FAX Commands 12.3 AT+F
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Chapter 13 - Short Message Service
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Chapter 14 - SIM-Related Commands C
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Chapter 14 - SIM-Related Commands 1
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Chapter 14 - SIM-Related Commands 1
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Chapter 15 - SIM Application Toolki
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Chapter 17 - Audio Commands Chapter
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Chapter 17 - Audio Commands Please
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Chapter 17 - Audio Commands 16.5 AT
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Chapter 17 - Audio Commands 16.10 A
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Chapter 17 - Audio Commands Chapter
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Chapter 18 - Hardware-Related Comma
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Chapter 19 - Miscellaneous Commands
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Chapter 20 - Summary Tables 20.2 St
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Chapter 20 - Summary Tables 20.3 AT
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Chapter 20 - Summary Tables Interne
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Chapter 20 - Summary Tables 20.4 Av
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Chapter 20 - Summary Tables Interne
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Chapter 20 - Summary Tables 20.5 AT
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Chapter 20 - Summary Tables SIM-Rel
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Chapter 20 - Summary Tables ^SSTN ^
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Chapter 20 - Summary Tables Command
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Chapter 20 - Summary Tables Command
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