Siemens NI-1200 Types of Service Supported, Baaic Isdn Terminal, Multiline Hunt Group

Issue 5, June 1999

terminal adapter and, instead, plug into the handset jack. These systems may include a key that controls the functions of the headset.)

Throughout Chapter 3. ALTERNATIVE CALL OPERATIONS, the headset is included in instructions for handling calls. In addition, Chapter 6. HEADSET OPERATION is devoted exclusively to the functions associated with the headset.

Types of Service Supported

Your Optiset terminal can support any of the following types of service provided by your telephone operating company:

•Basic ISDN terminal, with terminal-controlled call appearances

•Multiline Hunt Group (MLHG) call appearance

•Basic Electronic Key Telephone System (EKTS)

•Call appearance call-handling (CACH)

Baaic ISDN Terminal

When the Optiset terminal is connected to a plain ISDN line, as many line keys as desired can be programmed, up to the limit set by the switching system. These line keys can have the same or different directory numbers (DNs). You may make or receive any number of calls up to the limit the switching system places on your line, or up to the limit of 28 simultaneous calls that your Optiset terminal can handle.

Multiline Hunt Group

Your Optiset terminal can be part of a Multiline Hunt Group, an arrangement in which several phones are associated with the same ON by the central office. An incoming call to the MLHG ON is presented to the first available phone that is associated with the MLHG line.

Basic Electronic Key Telephone Service

The Optiset terminal, programmed for Electronic Key Telephone Service (EKTS), emulates the typical key telephone system used in

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Issue 5, June 1999

many businesses. In such a system, mUltiple DNs are shared by multiple phones; each phone can be used to make or answer calls on any of the shared DNs. EKTS provides the additional features of bridging into an active call of another user of the EKTS group, and preventing other users from bridging into a call.

Call Appearance Call-Handling

Call appearance call-handling (CACH) is an extension of EKTS. Each call appearance on the terminal is assigned a Call Appearance 10 (CAID) that is used by the switching system to determine the ON that is being used to place or receive a call.

For detailed information and instructions that apply to the eACH EKTS operation, refer to Chapter 5. OPTISET TERMINAL USED AS AN EKTS PHONE.

Additional Call Offering

When an incoming call is received by the Optiset terminal, it usually has a channel 10 assigned by the switch to define which of the two a-channels is used for the call. However, if both B-channels already are being used (either for connected calls or for ringing calls), the switch sends the call with no channel 10. This is referred to as an Additional Call Offering (ACO) call.

If the Optiset terminal is in Preview mode. pressing the line key continuously will preview the active or alerting call, followed by the longest waiting ACO call(s). in a cyclical fashion. If the terminal is in Line Hold mode, pressing the line key will put the current call on hold and answer the next call.

An ACO call cannot be answered if non-ACO calls are ringing and have not been answered yet (an ISDN reqUirement). If the user attempts to answer such an ACO call, the phone will beep. The reason for the beep is that if the phone attempts to answer the ACO call when non-ACO calls are still ringing, the ACO call will be disconnected. If an ACO call is presented when the phone has a connected call and no other calls are presented, the user can answer the ACO call, which will cause the connected call to go on hold.

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