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“main” (Installation and Administration) — 2004/6/25 — 13:29 — page 451 — #477
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21
Linux in the Network
Figure 21.8: ISDN Interface Configuration
2. ISDN card connected to a phone exchange
Again, the configuration may vary depending on the equipment in-
stalled:
(a) Smaller phone exchanges built for home purposes mostly use
the Euro-ISDN (EDSS1) protocol for internal calls. These ex-
changes have an internal S0 bus and use internal numbers for
the equipment connected to them.
Use one of the internal numbers as your MSN. You should be
able to use at least one of the exchange’s MSNs that have been
enabled for direct outward dialing. If this does not work, try a
single zero. For further information, consult the documentation
that came with your phone exchange.
(b) Larger phone exchanges designed for businesses normally use
the 1TR6 protocol for internal calls. Their MSN is called EAZ
and usually corresponds to the direct-dial number. For the con-
figuration under Linux, it should be sufficient to enter the last
digit of the EAZ. As a last resort, try each of the digits from 1 to
9.
451SUSE LINUX Enterprise Server