Application Of Direct Dialling Out (Ddo) - ASCOM Ascotel 2025 System Manual

ascom Ascotel 2025/2045/2065
4.5.6.4

Application of Direct Dialling Out (DDO)

If a fax server is connected to an S bus, individual fax receivers allocated a DDI
number can be specifically addressed. In terms of routing technology, this corre-
sponding to a DDO (Direct Dialling Out) function.
The fax server forwards the incoming faxes via e-mail to the relevant PC stations
that are set up as fax receivers.
ISDN
Fig. 3.11: Direct Dialling Out (DDO) to a fax server
Routing via Trunk Groups
Due to the configuration of the S interface as "S external" and the use of the
DSS1 protocol, the fax calls can be routed via routes and trunk groups. This means
that all fax receivers that have been allocated a DDI number can be reached via a
single S interface. For more details, see Part 2 under DDO.
3.34 Planning a PBX
DDI
PBX
S
haz0772aaena0
external
Fax server
S
Fax receiver
with allocated
DDI numbers
75
76
77
HBT_20321104_03/B0_en