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PBX Networking
328
Frequently Asked Questions
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 “Forum 500 / Forum 5000 –
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
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.
PBX Networking
Question: Why is it not possible to answer calls from another communica-
tions system via the missed calls list?
You get a call e.g. via a Q.SIG-IP / SIP tie line connection. Which line seizure
codes you will need to dial for the callback is not included automatically in the
information transferred with Q.SIG / SIP. Therefore, you need to setup the
callback in the bundle configuration. Call up the
Telephony
:
Trunks
:
Trunk
group
page. Change the desired Q.SIG / SIP bundle and enter the line seizure
code for the callback in the
Prefix for source phone number at incoming
internal
input field.
Question: Why is it not possible to reach a communications system indi-
rectly via another communications system?
You have interconnected e.g. three communications system with two Q.SIG-
IP / SIP tie line connections. While configuring the routes, you applied the
default “Business” selection for the
Type
setting. Call-switching for internal
calls is possible for the in-between communications system for internal routes
only. Change the Type setting for all affected routes to “Internal”.