Answering Incoming Calls

If the trunk number programmed using MMC405 is not in the valid address range for that line or not in the correct format, Telstra will replace the CLI number with the default directory number for that line as the call passes through the network. (For MSN lines, a valid number is either one of the MSN numbers for the line or the Group Directory Number. For DDI, a valid number is either the Group Directory Number or a number in the DDI range).

The DCS can only send the number programmed for the trunk as the CLI data. There is no provision for the DCS to send the indial number associated with the extension making the outgoing call.

All speech calls for an unrecognised destination number will be presented to the operator group.

The DCS will answer any speech or 3.1kHz calls.

The DCS will ignore any incoming data calls unless those calls are directed to an ISDN extension on the system capable of handling an incoming data call. (Only available on Version 4.2 software)

The DCS ignores any other optional information in the ISDN call such as Sub-Address, High Layer Compatibility or Low Layer Compatibility Information.

The DCS can only route incoming calls based on the destination number (DDI operation) or based on the incoming trunk (Normal operation).

An incoming call to a display keyset will show the CLI data in the top row of the LCD, as described above.

After the call is connected, pressing the dial keys on a keyset will send DTMF tones to line.

Making Outgoing Calls

Each B channel of a PRA can be treated the same as a PSTN line. (Refer to the section above on MMC420 programming for the Any Channel Yes/No option).

Each B channel will be assigned a trunk number in the range 701 upwards.

Each B channel can be programmed under a line key. The line can then be seized for an outgoing call by pressing the line key or incoming calls answered by pressing the line key.

ISDN lines can be assigned to trunk groups.

Least Cost Routing operates as usual with ISDN lines and can be used to select between ISDN and PSTN lines for outgoing calls as well as other more complex routing.

When a display keyset first seizes an ISDN line for an outgoing call, the LCD will show “Waiting for SETUP_ACK msg”. The message will be shown for either a few hundred milliseconds or a couple of seconds depending on whether the line has been used in the previous 60s.

The network will then return dial tone and the keyset will display ‘SETUP_ACK’.

After completion of dialling, the keyset will display ‘DIGIT_CO’ and may then display ‘ALERT_IN’ when the destination phone starts ringing.

After the call is connected, pressing the dial keys on a keyset will send DTMF tones to line eg. for use with voice mail systems.

Samsung DCS Application Note No 14 - Issue 01

Page 8 of 10

For Further Information Call LSP Communications

dcs application specifications

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