Answering A Call; Answering A Call For Dss1; Answering A Call For 1Tr6 - ZyXEL Communications Omni TA128 User Manual

Chapter 11 - Advanced ISDN Call Control
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 of
all the types of calls are UNASSIGNED, meaning the SETUP message sent by the Omni
TA128 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

The incoming call will first 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 Omni TA128. Voice calls or voice-band-data calls will be
assigned to the analog adapters.

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 Omni TA128 is highly integrated and multi-functional, it
can be imagined as a "black box" that contains multiple distinct terminals. Each of these
"internal terminals" can be assigned one ISDN number using the AT&ZIn=xxxx...
command.
The number assigned by AT&ZIn=xxxx... can be interpreted as either the MSN or the
Subaddress. This is determined by the bit 5 of S119 as follows.
S119.5=0
S119.5=1
The factory default for these numbers are unassigned. If an incoming SETUP message is
offered with addressing information (i.e. the appropriate part of the called party number
or the called party Subaddress), this address will be compared with the MSN/Subaddress
numbers assigned by the AT&ZIn=xxxx... commands. The call will be accepted using the
specific protocol if the assigned number of this protocol matches with the received called
party number or called party Subaddress.
Note : Two phone number strings are said to be matched if their least significant
"n" digit(s) are identical, where "n" is the number of digits of the shorter
string. Usually one digit is enough to distinguish the various protocols.

Answering a Call for 1TR6

If an incoming SETUP message is offered with addressing information (i.e. the
destination address W-element). This address will be compared with the EAZ numbers
number is treated as the MSN (default)
number is treated as the Subaddress
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