Lancom 1723 VOIP User Manual page 127

LANCOM 1722 VoIP – LANCOM 1723 VoIP – LANCOM 1724 VoIP – LANCOM 1823 VoIP
Chapter 12: Configuring the ISDN and analog interfaces in detail
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126
the ISDN connections are connected, for example, to an ISDN PBX which
is being supplied with ISDN timing from another source, then interference
to the transmission may arise because the timing of the LANCOM VoIP
Router is not synchronous to that of the PBX. In such cases, the reverse
setting allows the ISDN timing to be taken from an NT-mode interface, so
ensuring that the LANCOM VoIP Router runs synchronously with the over-
all system.
The PBX or remote station with an interface in TE mode must be able
and configured to transmit the timing.