Multi-Tech Systems CDMA Wireless Modem - Manual (Page 70)

Chapter 9 – Supplementary Service Commands
Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C 70
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;
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). 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.
ATH
Note: Release the all calls
ATD858551212
Note: Make a voice call
AT+WFSH=6195552121
Note: Place first call on hold, connect to second party.
AT+WFSH
Note: Connect all 3 parties.
AT+WFSH
ATH OK
+WEND:10
Note: All Calls End
OK
+WORG:858551212
+WCNT:3
Note: Conversation
OK
+WFSH
Note Modem now places first call on hold and
attempts connection to second call.
OK
+WFSH
Note: All 3 parties now connected.
OK
+WFSH
Note: Disconnect second party, connected to
first party only.
OK
+WEND:10