Siemens 4110 Digital exchange, Electronic code lock, En-bloc dialling, Enhanced line, Exchange

ISDN Glossary

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Digital exchange

Computer-controlled memory time switches are used to set up calls quickly and activate enhanced features such as => consultation calls, => call waiting, => three-party conference, => call deflection, etc.

D-channel

Control channel for an ISDN line. See Channel.

ECT (Explicit call transfer)

See Switching.

Electronic code lock

Personal identification number (=> PIN) that you can use, for example, to prevent people using your phone without your consent – calls to the emergency services can still be made however. Incoming calls can still be taken.

En-bloc dialling

Also known as advance dialling. You can key in the number you wish to call and make any necessary corrections. Then you can lift the handset or press the speaker key.

Enhanced line

ISDN line that offers three features more than the standard line: call deflection, advice of charge at the end of the call and T-Netbox.

Enquiry call

You are engaged in a call. You can use the "Enquiry call" function to interrupt the call briefly to set up a second external call or internal call to another subscriber. If you speak to the other person and then end the call, this was an enquiry call. If you switch back and forth between the first and second parties, this is called toggling.

Explicit call transfer (on ISDN telephone systems)

ECT. Subscriber A calls subscriber B, places the call on hold and calls subscriber C. Instead of now all talking in a three-party conference, A now transfers B to C and replaces the handset.

Exchange

A nodal point in the public telephone network. A distinction is made between local exchanges and long-distance exchanges.

Hands-free talking

The hands-free system on a telephone enables you hear the caller via the loudspeaker and talk to the caller via a built-in microphone without lifting the handset. Other people in the room can therefore also take part in the call.

Holding calls

(Hold). Interrupting and restoring an existing call. In particular, this is useful for consultation calls and toggling.

Hot key

This disables the telephone for all call numbers apart from one specific user- defined number. When the handset is lifted and any key is pressed a call is automatically made to the stored number. This is ideal for children who cannot be relied on to dial correctly. Calls to the emergency services can still be made. This function is available on Gigaset 3000/2000 Comfort handsets.

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