Telos Zephyr Xstream User Manual page 232

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ISDN TIP FOR BELLSOUTH CUSTOMERS!
Despite the fact the BellSouth originated the proposal for the standardised SPID (see above),
many regional Bell South offices leave off the last two digits of the SPIDs when giving them to
customers.
If you are a BellSouth customer and are given a SPID of the format: Area Code + 7 digits +
01 and you get "SPID Error" your correct SPID is probably Area Code + 7 digits + 0101 or
Area Code + 7 digits + 0100.
MSN/DN 1 (Multiple Subscriber Number/Directory Number 1)
The use of this field depends on the ISDN protocol used on your ISDN BRI circuit.
Directory Numbers (National I‐1 and DMS Cust.)
When you are using an ISDN protocol other than ETS 300, INS 64, or AT&T Cust.
(PTP), you must enter the "Directory Number" (DN) here. This is the first DN.
This is simply the 7‐digit telephone number.
A mis‐entered DN will cause problems with incoming calls to that channel.
Multiple Subscriber numbers (ETS 300 and INS 64 only)
Used only when you are using the ETS 300 Euro ISDN or INS 64 Japanese ISDN
for your Telco mode, and another ISDN device is sharing the line with the
Zephyr Xstream. MSN1 corresponds to the first B channel. This is simply one of
your assigned telephone numbers (often you will be assigned 3 or more).
If no MSNs are entered, the first call to any of the numbers associated with the
ISDN circuit will ring in to the Xstream as "line 1" if that "line" is idle. If "line 1" is
in use, the call will ring in on "line 2". This is precisely the same behavior as
when a line with the "AT&T Custom PTP" protocol is used.
ETS‐300 ISDN service frequently includes 3 MSNs. Typically one of these would
be entered in all voice terminals, with the others entered in the Xstream.
A mis‐entered MSN will cause problems with incoming calls to that channel.
Since these are not needed, you should leave them blank unless specifically
needed.
MSN/DN 2
The second MSN or DN. See above.
USER'S MANUAL
Section 11: THE WORKS – Detailed Menu Reference 220