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Chapter 9 – Supplementary Service Commands

Multi-Tech Systems, Inc. AT Commands for EDGE (E1) Modems (S000474A) 136

9.7 AT+CCWA Call Waiting

Description: 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 <n>.

Syntax: Test Command: AT+CCWA=?

Response: +CCWA:(list of supported <n>s)

Read Command: AT+CCWA?

Response: +CCWA:<n>

Write Command: AT+CCWA=[[<n>][, <mode>][, <class>]]

Response: If <mode> is not equal 2 and command successful:

If <mode>= 2 and command successful:

+CCWA: <status>, <class>

[+CCWA: <status>, <class>]

[+CCWA: ...]

If error is related to ME functionality:

+CME ERROR: <err>

Parameters:

<n>

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”

<mode>

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)

<class>

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 <class> 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: <calling number>, <type of number>, <class>, , <CLI validity>”, parameter <class> specifies

the class of the waiting call.

1 Voice

2 Data

<class> 2 (data) comprises all those <class> values between 16 and 128 that are supported both

by the network and the MS. This means, a setting made for <class> 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.

7 Voice, data (1+2). Default.

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 and data). 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 number>.

Type of address octet in integer format (refer to GSM 04.08, subclause 10.5.4.7)

145 <calling number> includes international access code character ‘+’

128 Number restricted

129 Otherwise

1 2 ... 131 132 133 134 135 136 137 138 139 140 141 ... 307 308

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