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GM29 INTEGRATOR’S MANUAL
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LZT 123 7361 R1B
2.4.3 Voice Calls
The GM29 offers the capability of mobile originated and mobile
terminated voice calls, as well as supporting emergency calls.
Multi-party, call waiting and call deflection features are available.
Some of these features are network-operator specific.
For the inter-connection of audio, the modem offers a balanced 4-wire
analogue interface.
DTMF (Dual Tone Multi Frequency) is supported.
2.4.4 Data
The modem supports the following data protocols:
• GPRS (General Packet Radio Service).
Modems are Class B terminals, which provide simultaneous
activation and attachment of GPRS and GSM services. GM29
modems are GPRS class 8 (4+1) enabled devices, which are capable
of transmitting in one timeslot per frame (up link), and receiving at a
maximum of four timeslots per frame (down link).
• CSD (Circuit Switched Data).
GM29 modems are capable of establishing a CSD communication at
9.6kbps.
• HSCSD (High Speed Circuit Switched Data).
GM29 supports HSCSD class 2 (2+1) communication, with one
timeslot per frame capacity in the up link and two timeslots per
frame capacity in the down link.
2.4.5 Fax
The GM29 allows fax transmissions to be sent and received by
commercial software installed on the application computer. Group 3 fax
Classes 1 and 2 are supported.
2.4.6 Supplementary Services
• Call forwarding
• Call hold, waiting and multiparty
• Calling/called number identification
• Advice of charge
• USSD
• Alternate line service
• Customer service profile
• Preferred networks
• Operator selection