ZyXEL Communications ACCESSING INTERNET & INTRANET omni series - Manual (Page 97)

Advanced ISDN Call Control 85
Each type of outgoing call can be assigned with one origination EAZ
by using the command AT&ZOx=Origination_EAZ, where x = I
for ISDN data calls, A for the analog adapter 1, and B for the analog
adapter 2.
The command AT&ZOx=// removes the assignment of the
origination EAZ.
The number assigned by AT&ZOx=Origination_EAZ, if any, will
be used for the Origination Address W-element while dialing. The
default settings of origination EAZ for all types of calls are
UNASSIGNED, meaning the SETUP message sent by the TA
contains no Origination Address W-element.
The command AT&ZO? can be used to list the current settings of
the origination EAZs.
Answering a Call
Incoming call will be identified as either an ISDN data call or a voice
call (including the voice-band-data). ISDN data calls will be routed
to the digital communications portion of the TA.
Non-data models will assign voice calls or voice-band-data calls to
the analog adapter(s).
Answering a Call for DSS1
The Multiple Subscriber Number (MSN) supplementary service
provides the possibility for assigning multiple ISDN numbers to a
single ISDN BRI line. Calling users can select, via the public
network, one or more distinct terminals on a BRI line.
In some areas however, it is very expensive to get additional
subscriber numbers. The subaddress, which is transferred
transparently by the ISDN network between the call originating
entity (e.g. the calling user) and the addressed entity, can be used for
the same purpose as the MSN. Since the TA is highly integrated and
multi-functional, it can be imagined as a “black box” that contains