Multitech MultiModem Cell MTCBA-C1 User's Guide Page 43
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Chapter 9 – Call Control Commands
Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide (PN S000478C) 43
Send Flash to Base Station +WFSH
Description: This command sends a flash or flash with information to the base station. The flash command is
used to manage call waiting and 3-way calls. For call waiting situations when the 3rd party call is
received, send a flash (AT+WFSH) to toggle between the two different call parties. The +WFSH
unsolicited AT command will be returned if a flash was sent to the base station over the air. Note
that on CDMA networks, this does not guarantee that an actual switch between calls took place,
because there is no acknowledgement to the modem.
For 3-way calls, initiate the first call to party # 1 (see ATD). Then send a flash with information
(AT+WFSH=18005551212) to initiate a call to party # 2; party # 1 will automatically be placed on
hold. The “information” is the phone number of party # 2. Once a conversation with party # 2 is
established, send a regular flash (AT+WFSH) to connect all 3 parties. Send another flash
(AT+WFSH) to disconnect party # 2, or End call (see ATH) to end the call with all parties.
Syntax: Command syntax: AT+WFSH
AT+WFSH= < phone_number > (for a flash with information)
Unsolicited result syntax: +WFSH (confirms a flash was sent to the base station)
Command Possible Responses
ATD8585551212;
Note: Make a voice call
AT+WFSH
Note: Send a flash to the Base Station (toggle to
the second call).
Note: Conversation with second call.
AT+WFSH
Note: Send a flash to the Base Station (toggle to
the first call).
ATH
Note: Release all calls
OK
+WORG:8585551212
+WCNT:3 Note: Conversation…
+CCWA:”8582701234”,129
Note: Indication of another incoming call
OK
+WFSH
Note: Flash sent to the Base Station. Call to
the second call. However, this is not 100%
guaranteed because there is no
confirmation from the Base Station.
OK
+WFSH
Note: Flash sent to the Base Station. Call
switches to the first call. However, this is not
100% guaranteed because there is no
confirmation from the Base Station.
OK
+WEND:10
Note: All Calls End
- CDMA-C1 AT Commands 1
- Contents 3
- Chapter 1 – Introduction 7
- Chapter 2 – AT Commands 8
- Overview 8
- Command Types 9
- Command Format and Syntax 9
- Input Command Syntax 10
- Other Syntax 10
- Output Response Syntax 10
- Parameter Defaults 10
- Unsolicited Message Syntax 11
- Attention AT 12
- Repeat Last Command A/ 12
- Echo E 12
- Bits +WUSLMSK 13
- Chapter 4 – Identification 15
- Commands 15
- Chapter 5 – Query Commands 17
- Chapter 6 – Global 18
- Configuration Commands 18
- Save Configuration &W 19
- Chapter 7 – Status Commands 20
- Chapter 8 – Communication 26
- Set Diagnostic Port +WDMX 27
- Set DCD Signal &C 27
- Set DTR Signal &D 28
- Set DSR Signal &S 28
- Automatic Answer S0 30
- Command Edit Character S5 31
- Chapter 9 – Call Control 33
- Hang-Up Command H 34
- Answer a Call A 34
- Incoming Call +RING 35
- Emergency Mode +WSOS 37
- Call Answered +WANS 38
- Call Connected +WCNT 38
- Call Ended +WEND 39
- Call Originated +WORG 40
- CPHS Command +CPHS 40
- Call Forwarding +CCFC 42
- Send DTMF Tones +VTS 44
- Chapter 10 – Network Service 45
- Signal Quality +CSQ 46
- Band Preference +WBND 49
- Service Indication +WSRV 50
- Roam Preference +WRMP 50
- Default Cell Band +WDCB 51
- Roaming Indication +WROM 51
- Chapter 11 – Provisioning 54
- Control Commands 54
- Excess SPC Failures +WLCK 55
- Download PRL +DPRL 56
- Commit Changes +WCMT 58
- Set IMSI +WIMI 58
- Slot Cycle Index +WSCI 60
- SID and NID +WSID 60
- Chapter 12 – OTASP / OTAPA 61
- Commit Successful +WOTC 62
- SPL Unlocked +WOTS 62
- NAM Download OK +WOTN 62
- MDM Download OK +WOTM 62
- IMSI Download OK +WOTI 63
- PRL Download OK +WOTP 63
- Chapter 14 – Short Message 70
- Service Control Commands 70
- Read Message +CMGR 71
- List Message +CMGL 72
- Delete Message +CMGD 73
- Chapter 15 – Audio Commands 79
- Microphone Gain +VGT 81
- Speaker Gain Control +VGR 82
- Digital Gain Receive +WDGR 84
- Echo Cancellation +ECHO 86
- Speaker Driver Gain +WSDG 87
- Audio Loopback &T 88
- Chapter 16 – Data Commands 89
- R-SCH Selection $QCMIP 90
- MIP Selection $QCMIPP 91
- Chapter 17 – TCP APP AT 98
- Chapter 18 – Sleep Commands 107
- Builds) 111
- Chapter 19 – Antenna 111
- Commands (Not for IP and GPS 111
- +WANTPOLL 113
- Auxiliary GPS Power +WANT 115
- Scenarios 118
- Call Processing 119
- Sending Binary Data 120
- TCP Socket Examples 121
- TCP Server Example 122
- ATZ, and AT&F 123
- Chapter 22 – CDMA 128
- Terminology and Acronyms 128
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