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Chapter 9 – Supplementary Service Commands 9.7 AT+CCWA Call Waiting Description: Test Command Syntax: AT+CCWA= Response: The AT+CCWA write command controls the “Call Waiting” supplementary service according to GSM 02.83. Activation, deactivation and status query are supported. The read command returns the current value of . +CCWA:(list of supported s) OK Read Command Synatx: AT+CCWA Response: +CCWA: OK Write Command Syntax: AT+CCWA=[[][, ][, ]] Response: If is not equal 2 and command successful: OK If = 2 and command successful: +CCWA: , [+CCWA: , ] [+CCWA: ...] OK If error is related to ME functionality: +CME ERROR Parameter Descriptions: Switch URCs “+CCWA” and “^SCWA” for call waiting on/off 0 Disable display of URCs “+CCWA” and “^SCWA” 1 Enable display of URCs “+CCWA” and “^SCWA” Network operation to be performed for Supplementary service call waiting 0 Disable call waiting (disable service) 1 Enable call waiting (enable service) 2 Query status of call waiting (query service status) Integer or sum of integers each representing a class of information; i.e., a bearer service, telecommunication service or bearer service group as defined in “GSM 02.04”. In the write command, parameter specifies the class of the active call during which an incoming call of any class is to be regarded as a waiting call. In URC “+CCWA: , , , , ”, parameter specifies the class of the waiting call. 1 Voice 2 Data 2 (data) comprises all those values between 16 and 128, that are supported both by the network and the MS. This means, a setting made for 2 applies to all remaining data classes (if supported). In addition, you can assign a different setting to a specific class. For example, you can activate call waiting for all data classes, but deactivate it for a specific data class. 4 Fax 7 Voice, data and fax (1+2+4). Default. 8 SMS 16 Data circuit sync 32 Data circuit async 64 Dedicated packet access 128 Dedicated PAD access 1...255 Default = 7. Combination of some of the above classes. For example, the default setting 7 represents the sum of the integers 1, 2 and 4 (CF for voice, data and fax). The value 255 covers all classes. If parameter “class”is omitted, the default value 7 is used. 0 Call waiting service is not active 1 Call waiting service is active Phone number of waiting caller in the format specified by parameter . Type of address octet in integer format (refer to GSM 04.08, subclause 10.5.4.7) 145 includes international access code character ‘+’ 129 Otherwise 0 CLI valid 1 CLI has been withheld 2 CLI is not available Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371B) 112
Chapter 9 – Supplementary Service Commands Unsolicited Result Codes: URC 1 Indication of a call that is currently waiting and can be accepted. +CCWA: , , , , If =1 and the call waiting supplementary service is enabled in the network, URC “+CCWA” indicates a waiting call to the TE. It appears while the waiting call is still ringing. URC 2 Indication of a call that has been waiting. ^SCWA If =1 and the call waiting supplementary service is enabled in the network, this URC indicates that a waiting call rang when the ME was in online mode during a CSD call, but the calling party hung up before the ME went back to command mode. Notes • If the active call is a CSD call, and a waiting call is received, then the ME produces a BREAK while still in online mode, and displays ∗ the +CCWA URC (as above) when the ME goes back to command mode while the waiting call is still active and can be accepted; ∗ or the ^SCWA URC (as above) when the ME goes back to command mode after the waiting call has ended. • With the AT+CHLD command, it is possible to establish a multiparty call or to set the active voice call on hold and then accept a waiting voice call (not possible with fax and data call). See also AT+CHLD • Users should be aware that if call waiting is activated (=1), the presentation of URCs needs to be enabled, too (=1). Otherwise, on the one hand, a waiting caller would be kept waiting due to lack of BUSY signals, while, on the other hand, the waiting call would not be indicated to the called party. • The AT+CCWA command offers a broad range of options according to the GSM specifications. However, when you attempt to enable call waiting for a for which the service is not provisioned or not supported, the setting will not take effect regardless of the response returned. The responses in these cases vary with the network (for example “OK”, “Operation not allowed”, “Operation not supported” etc.). To make sure check the current call waiting settings with =2. • The AT+CCWA command has been implemented with the full set of parameters according to GSM 07.07. For actual applicability of SS call waiting to a specific service or service group (a specific value) please consult table A.1 of GSM 02.04 • Despite the specifications stated in GSM 02.04 call waiting is not handled uniformly among all networks: GSM 02.04, Annex A, provides the following specification: “The applicability of call waiting refers to the telecommunication service of the active call and not of the waiting call. The incoming, waiting, call may be of any kind.” Nevertheless, networks do differ on the actual implementation of the service. For example, the activation of call waiting for 4, “fax”, causes some networks to send a call waiting indication if a call “of any kind” comes in during an active fax call, but others may (with the same settings active) indicate a waiting fax call during any kind of active call. Thus, the only reliable way to receive or prevent a call waiting indication under any circumstances and in any network, is to activate or deactivate call waiting for all tele- and bearer services ( 255). Examples Example 1 Parameter at+ccwa=1 OK Example 2 Parameter at+ccwa=,1 OK at+ccwa=,2 at+ccwa=1,1 at+ccwa=1,2 at+ccwa=1,4 OK Example 3 Parameter AT+CCWA=,0,1 OK To enable the presentation of the URC To activate the supplementary service in the network for voice, data, and fax calls (default classes). Note that parameter is left out. In this case, the current value of will be retained. To query the network status of call waiting for default classes Call Waiting is activated during voice calls. Call Waiting is activated during data calls. Call Waiting is activated during fax calls. To deactivate call waiting for voice calls. Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371B) 113
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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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Page 61 and 62: 5.2 AT+CPIN2 PIN2 Authentication Ch
Page 63 and 64: Chapter 4 - Serial Interface Contro
Page 65 and 66: 5.4 AT+CLCK Facility Lock Chapter 4
Page 71 and 72: Chapter 6 - Identification Commands
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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
Page 87 and 88: Chapter 7 - Call-Related Commands
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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+
Page 149 and 150: Chapter 11 - GPRS Commands 11.7 AT+
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Page 155 and 156: 11.10 AT+CGQMIN Quality of Service
Page 157 and 158: Chapter 11 - GPRS Commands 11.11 AT
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Chapter 11 - GPRS Commands 11.17 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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