Call routing221System functions and features as of R3.0syd-0367/1.3 – R3.0 – 03.20136. 5. 5 Call to a DSS1 Terminal equipment on the S Bus (DDO)The BRI-S external interface can be used to address a terminal equipment that has itsown direct dialling plan. The system dials the terminal's end destinations using DDInumbers, which is equivalent to a DDO (direct dialling out) function. An externalfax server is an example of one such terminal.A PISN user is created in the communication server for each outgoing direct dial-ling number.Fig. 94 Call to a terminal with its own direct dialling planThe following services are supported on BRI-S external :• Base Call• CLIP / CNIP• Call charge information• Numbering plan identifier NPI PNPTrunk group 2• Network interfaces Network interfaces of this trunk group• Network type Private• Protocol QSIG or QSIG / PSS1 ISOParameter Parameter value
