Multi-Tech Systems CDMA Wireless Modem manual Send Flash to Base Station +WFSH, At+Wfsh

Chapter 9 – Supplementary Service Commands

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 3 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. rd

Syntax:	AT+WFSH
	Command syntax: AT+WFSH
	Command syntax 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;	OK
		Note: Make a voice call	+WORG:8585551212
			+WCNT:3 Note: Conversation…
			+CCWA:”8582701234”,129
			Note: Indication of another incoming call
		AT+WFSH	OK
			+WFSH
		Note: Send a flash to the Base Station (toggle to the second
		call).	Note: Flash sent to the Base Station. Call to the
		Note: Conversation with second call.	second call. However, this is not 100%
			guaranteed because there is no confirmation
			from the Base Station.
		AT+WFSH	OK +WFSH
		Note: Send a flash to the Base Station (toggle to the first call).	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.
		ATH	OK
		Note: Release the all calls	+WEND:10
			Note: All Calls End
		ATD858551212	OK
		Note: Make a voice call	+WORG:858551212
			+WCNT:3
			Note: Conversation
			OK
			+WFSH
			Note Modem now places first call on hold and
			attempts connection to second call.
		AT+WFSH=6195552121	OK
		Note: Place first call on hold, connect to second party.	+WFSH
			Note: All 3 parties now connected.
		AT+WFSH	OK
		Note: Connect all 3 parties.	+WFSH
		AT+WFSH	Note: Disconnect second party, connected to
			first party only.
		ATH	OK
			+WEND:10

Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C 70