C55/C55i AT COMMAND SET Description Preliminary - Falcom

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C55/C55I AT COMMAND SET VERSION 1.00 2 CLI is not available 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, awaiting 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 To enable the presentation of the URC This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission. Page 158
C55/C55I AT COMMAND SET VERSION 1.00 OK EXAMPLE 2 Parameter at+ccwa=, 1 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. OK at+ccwa=, 2 To query the network status of call waiting for default classes. at+ccwa=1 ,1 Call Waiting is activated during voice calls. at+ccwa=1 ,2 Call Waiting is activated during data calls. at+ccwa=1 ,4 Call Waiting is activated during fax calls. OK EXAMPLE 3 Parameter AT+CCWA=, 0,1 To deactivate call waiting for voice calls. OK 8.8 AT+CHLD Call Hold and Multiparty Syntax Test Command AT+CHLD=? Write Command AT+CHLD=[] Response(s) +CHLD: (list of supported s) OK Response(s) OK ERROR +CME ERROR: Reference(s) PIN ASC0 GSM 07.07 ● ● Command Description TA controls the Supplementary Services Call Hold and Multiparty. Calls can be put on hold, recovered, released, and added to a conversation. Like for all Supplementary Services, the availability and detailed functionality of Call Hold and Multiparty services depends on the configuration of the GSM network. The C55 can only request the service, but the network decides whether and how the request will be answered. Parameter Description (num) 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") This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission. Page 159
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C55/C55i AT COMMAND SET Description Preliminary - Falcom

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