MTCMR-G-F4 Multi-Tech Systems, MTCMR-G-F4 Datasheet - Page 87

• Manufacturer Part Number: MTCMR-G-F4
• Description: MODEM GPRS QUAD BAND GSM GLOBAL
• Manufacturer: Multi-Tech Systems
• Series: MultiModem® iCellr

Specifications of MTCMR-G-F4

• Frequency: 850MHz, 900MHz, 1.8GHz, 1.9GHz
• Applications: General Purpose
• Interface: RS-232, USB
• Function: Transceiver, Modem
• Data Rate - Maximum: 115.2kbps
• Modulation Or Protocol: GSM, GPRS
• Voltage - Supply: 9 V ~ 32 V
• Package / Case: Module with Case
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Power - Output: -
• Sensitivity: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 881-1151; MTCMR-G-F4

Call Related Supplementary Services +CHLD
Multi-Tech Systems, Inc. GPRS AT Commands Reference Guide (Document Number S000293J)
Description:
Values:
Syntax:
This command manages call hold and multiparty conversation (conference call). Calls can be put on
hold, recovered, released or added to a conversation.
<n>
Command syntax: AT+CHLD=< n >
Command
AT+CHLD=<n>
AT+CHLD=?
0
1
1x Release a specific call X (active, held or waiting)
2
2x Place all active calls on hold except call X with which communication is supported.
3
4
Release all held calls or set User Determined User Busy (UDUB) for a waiting call.
Release all active calls (if any exist) and accepts the other (held or waiting) call.
Place all active calls (if any exist) on hold and accepts the other (held or waiting) call.
Adds a held call to the conversation.
Connects the two calls and disconnects the subscriber from both calls (Explicit Call Transfer).
Possible responses
OK
Note: If n is within the defined values
+CHLD: (0-4, 11-17, 21-27)
OK
Chapter 10 – Supplementary Services Commands
87