LANCOM 1722 VoIP – LANCOM 1724 VoIP
Chapter 1: Introduction
29
EN
If no entry is found in the call-routing table, then the Call Manager
searches through the list of local subscribers. Call routing considers all of
the users known to the call router (registered SIP users, configured ISDN
users). If an entry is found that agrees with the called number and that
has the matching destination domain, then the call is delivered to the cor-
responding subscriber.
If there is no local subscriber with matching number and destination
domain, then the following cycle searches for an agreement between the
number of the local subscriber and the called number; the destination
domain is ignored.
Resolution of the call with default entries in the call-routing table
If the preceding cycles referring to the call-routing table and lists of local
subscribers remain unsuccessful, then the waiting call is checked once
again with the call-routing table. This pass only takes the default routes
into account, however. The numbers and destination domains entered
into the default routes are ignored. Only the source filters are processed,
assuming that the default routes has these filters.
Specific examples of call-routing procedures can be found in the con-
figuration examples described.
1.5.5
Making telephone calls with the LANCOM VoIP Router
Using the LANCOM VoIP Router opens up a variety of new possibilities for
making telephone calls. Depending on the constellation of terminal equip-
ment implemented (e.g. SIP or ISDN telephones, SIP or ISDN PBX systems)
and, depending on the configuration for call routing in the LANCOM VoIP
Router, certain information is critical for understanding the establishment of
connections.
Automatic outside line access
Using the LANCOM VoIP Router and the enhancement with VoIP functionality
within your telephone structure is designed to support the users' telephone
behavior with the greatest possible convenience. One of the core aspects of
this is the use of "spontaneous" or "automatic" outside line access, a feature
that is familiar to users of standard PBX systems.
Most PBX systems are configured in such a way that the telephone sub-
scribers must dial a "0" before the desired telephone number in order to
