31.5.02 06-S46 Body.fm i 37 Eagle Am Engl, A31008-H4500-A1-4-7619

22

Making a Call

 

 

 

Call transfer

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;menu§ Select to open call menu,

then select Call transfer.

The original call is joined to the second one. For you, both calls are now ended.

Call menu

The following functions are available only during a call:

;menu§ Select to open menu.

 

Microphone

Turn the microphone on or

 

on

off. When off, the person on

 

 

 

the other end of the line

 

 

 

cannot hear you. DTMF

 

 

 

signals (key beeps) can

 

 

 

still be heard if you use the

 

 

 

keypad.

 

 

 

 

(You can also press and hold

 

 

 

*to turn the microphone

 

 

 

on and off. You and the other

 

Volume

caller will hear a key tone.)

 

Adjust earpiece volume.

 

Conference

See page 21.

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Time/cost

While the connection

 

 

 

 

continues, the call duration

 

 

 

and (if set, page 52) the call

 

Send DTMF

cost are displayed.

 

 

See page 22.

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Call transfer

See page 22.

 

Main menu

Access the main menu.

 

 

 

 

 

 

 

 

 

 

Call status List all held and active calls (for example, participants in a conference call).

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Send DTMF tones

You can enter digits during a call to operate an answering machine or respond to any other system that requires a touch tone response. These digits or codes are transmitted directly as DTMF (Dual Tone Multiple Frequencies) signals.

DTMF signals are the key beeps you hear when entering a number on a touch tone phone.

To send DTMF tones during a call:

;menu§ Select to open call menu,

then select Send DTMF.

J Enter the digits or control code.

OK§ Select to send tones.

Control codes (DTMF tones) stored in the address book (p. 28) or in the SIM phone book (p. 31) can also be used.

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Siemens GSM 900, GSM 1900, TDMA 800, TDMA 1900 manual Call menu, Send Dtmf tones
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GSM 900, GSM 1900, TDMA 1900, TDMA 800 specifications

Siemens is a renowned telecommunications equipment manufacturer known for its innovative solutions in mobile communication. Among its notable contributions are the TDMA 800, TDMA 1900, GSM 900, and GSM 1900 systems. These technologies have played a significant role in shaping mobile telephony, particularly during the late 20th century.

TDMA, or Time Division Multiple Access, is a digital transmission protocol that allows multiple users to share the same frequency channel by dividing the signal into time slots. The Siemens TDMA 800 operates in the 800 MHz frequency band, which is ideal for regional mobile communication. Its main features include improved call quality, greater capacity, and effective handover capabilities. This system was particularly popular in the United States, where it formed the backbone of early digital cellular networks.

On the other hand, the TDMA 1900 operates in the 1900 MHz band, catering to urban areas with higher population densities. This system further enhances voice clarity and offers faster data transmission speeds. Its key characteristics include support for features such as call waiting, caller ID, and enhanced voice privacy, making it suitable for modern telecommunication needs.

GSM, or Global System for Mobile Communications, is another critical technology developed by Siemens. The GSM 900 operates at 900 MHz and is one of the most widely adopted mobile standards globally. Its contributions to the communication landscape include superior frequency reuse, allowing for a greater number of simultaneous calls. The GSM 900 also supports various services beyond voice calls, including SMS (Short Message Service) and basic data transmission.

Meanwhile, GSM 1900, which functions in the 1900 MHz frequency band, is predominantly used in North America. This technology shares many features with GSM 900, but it accommodates a larger number of channels per frequency unit due to its higher frequency. The GSM 1900 system has been critical in facilitating the growth of mobile data services, providing a solid foundation for the evolution of mobile internet access.

Overall, Siemens' TDMA and GSM technologies have significantly influenced the development of mobile telecommunications. With features focused on capacity, flexibility, and quality, these systems established the groundwork for the advanced mobile networks we rely on today. Their legacy continues to be seen in the current generation of wireless technologies, highlighting the importance of innovation in the telecommunications industry.
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