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access to all long distance and international calls or only to local or specific long distance or international numbers (for example, customers or your organization's branch offices) on a station -by- station basis. Tone and pulse telephones SLT extensions may be either impulse dial (type 500) or DTMF (type 2500). Dialing from pulse SLTs can be converted for outside dialing on DTMF trunks. Trunk groups Trunks defined in a group can be accessed by a single code or dedicated button on the DIGITAL telephone set Up to ten trunk groups can be defined in the DIGITAL KEY BX system, and up to 32 trunk groups can be defined in the DIGITAL 400 system. Trunks The following trunk related parameters apply to the system. Ground start: DIGITAL systems interface with ground or loop start type outside lines via a COG or TI card. Loop start: DIGITAL systems interface with loop start type outside lines via a COL, CHL, COG or TI card, or in the DIGITAL KEy' BX system four ports on the DIPD. TIE line interface: DIGITAL systems interface with TIE lines via an EMU card or a TI /El card. Direct Inward Dial (DID). DIGITAL systems translate incoming dialed digits to enable direct inward dialing to specific extensions. Open loop detection: If supported by the Central Office, DIGITAL systems recognize an open loop state when a call has been placed on hold, and it disconnects the line. Pulse or DTDfF: Each trunk in the DIGITAL systems can be programmed as a pulse or DTDIF trunk. Pulse to DTb1F conversion: When required by certain types of calls over a number of carriers, DIGITAL systems can dial (via LCR) both pulse and DTbIF for a single subscriber number. Pulse to DTMF conversion of 52 ' DIGITAL Family Features an outside line can also be included in all types of automatic dialing; that is, speed dial, redial, save /repeat, automatic redial, or on a memory button. Tone detection:'fo enable automatic redial, auto dialer (scanner) and speed dial chaining, DIGITAL systems have call progress tone detectors which can recognize dial tone, busy tone, reorder tone and ringback tone. Battery reverse detection: When connected to an inter- office trunk, DIGITAL systems can detect reverse polarity caused by a closed loop. Uniform call distribution (UCD) The volume of call traffic can be divided equally and fairly among system users to ensure uniform distribution of the call traffic load and quicker response for incoming callers. Voice mail See Voice tnail in Section B, TelradlVpl Voice Mail and Application Server, above. Nall mounting station To free desk space and for ease of operation, all DIGITAL stations are wall - mountable. 36 button Add -ot unit The 30 button Add -on unit provides one -touch dialing Of up to 128 Director Numbers and speed dial numbers. Up to four units may be chained together and attached to any Attendant, Executive station or Display Speakerphone set. Alternatively you can shift between the four button maps on a single Add -on unit. With the DIGITAL 400 system, up to eight button maps may be programmed with four assigned to each 36 button Add- on unit.