Specifications

Chapter 19 – Host Application Scenarios
114 Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide
Call Processing
Call Origination
Use the ATD command to originate calls.
Answer Incoming Call
To answer incoming calls either use the ATA command or set the Automatic Answer S0 register value to a non-
zero value.
Hang Up Call
To terminate calls either use the ATH command or negate the modem signal DTR on UART1. See the AT&D
command for more information.
Subscriber Calling Features
Subscriber Calling Features provides voice call services beyond making a single call. The services are
implemented to a large extent on the network side and can vary among different operators. The examples
below are for the service provider Verizon, but should apply for most operators.
The services supported by the CDMA-C1 device are:
● Calling Line ID
● Call Forwarding
● Call Waiting
● Three-way calling
See Call Commands for more information about voice call services.
Calling Line ID
The caller‘s ID, if presented to the network during an incoming call, is reported as a +CLIP unsolicited message if
the AT+CLIP=1 command is issued. For example:
AT+CLIP =1
OK
RING
+CLIP: "9195551212",129
Call Forwarding
Your application can unconditionally forward or cancel forwarding of all incoming calls by using the AT+CCFC
command.
Call Waiting
The device will report an incoming call while a call is active by using the +CCWA unsolicited response.
Three-Way Calling
Use AT+WFSH command to initiate and manage three-way calling.
SMS