T-Comfort Comfort Pro S, Mounting And Commissioning Manual

Page: 185 / 200

183
Telephony Frequently Asked Questions
Question: Calls can be made but
not received with one of the ISDN
telephones.
The internal call number that has been configured for this ISDN
telephone in the Configurator ( Telephony: Ports: S0 menu) must
also be configured as an MSN on the ISDN telephone itself. For
further information, refer to the User Guide of your ISDN telephone.
Question: An ISDN telephone
always rings, if another telephone
on the S
0
bus is being called.
This case also requires configuring the MSN on the ISDN telephone
(see above answer).
Question: It is not possible to
configure Call Distribution:
Outgoing for multi-terminal
access.
You have configured multi-terminal access and system access in
parallel. All outgoing calls are therefore established via system
access, and outgoing call distribution can be configured for system
access only in the Configurator ( Telephony: Call Distribution
menu).
A specific MSN can be seized for individual calls by means of a
code number procedure. For further information, refer to the
“Operation on Standard Terminals” user guide.
Question: What are some of the
causes for problems when sending
and/or receiving faxes?
In frequent cases, the reason may be found in a problem with the
ISDN-L1 reference clock distribution. The L1 clock is delivered from
the network provider. An unclean L1 clock distribution and the
introduced signalling jitter is overheard by the human ear.
Nevertheless, data and fax transmissions may be disturbed by the
jitter. Please check, which ISDN lines will deliver the L1 clock.
Details can be found under L1 Clock starting on page 121.
The fax data transfer possibly is routed via a compressing VoIP
connection. Please verify, if the a/b port is configured with the “Fax”
setting. For the VoIP connection, select a VoIP profile which
includes the non-compressing G.711 codec.