Control Of Endgeräteauswahlziffer (Eaz) - ZyXEL Communications Omni TA128 User Manual

Chapter 11 - Advanced ISDN Call Control
Control of ENDGERÄTEAUSWAHLZIFFER (EAZ)
EAZ (or Terminal Selection Code) is the last digit of an ISDN phone number in 1TR6.
Usually EAZ=0 indicates that a global call (any terminal on the S0 interface) which is
service-compatible with the incoming call, can answer the call.
Other values of EAZ (1,2,....,9) provides the possibility for assigning multiple ISDN
numbers to a single ISDN BRI line. A calling user can select, via the public network, one
or more distinct terminals on a single BRI line.
With its highly integrated, multi-function features, the Omni TA128 can be imagined as a
"black box" containing multiple distinct terminals. Each of these "internal terminals" can
be assigned one EAZ using the command AT&ZI n = m , where n=0-7 and m= 0-9.
Command Function
&ZI0=m assigns EAZ for X.75
&ZI1=m assigns EAZ for V.110
&ZI2=m assigns EAZ for V.120
&ZI3=m assigns EAZ for PPP, MPPP
&ZI4=m assigns EAZ for ISDN data, protocol auto-detection
&ZI5=m assigns EAZ for PPP, MPPP
&ZI6=m assigns EAZ for Phone 2
&ZI7=m assigns EAZ for Phone 1
Table 11-1
The default EAZ of each protocol is as follows :
&ZI 0=1
&ZI 4=2
&ZI 6=3
&ZI 7=4
AT&ZI? can be used to display the EAZ numbers assigned by the AT&ZIn=m
commands.
The EAZ (last digit) of the destination address in an incoming SETUP message will be
checked with each protocol's EAZ. If there is a match and the service indicated is
compatible with this protocol, the call will be accepted using the protocol.
Note: The EAZs must be assigned precisely in order to accept calls accordingly.
The suffix digit to an ISDN phone number in a dial out command will be used as the
destination EAZ (in the Destination Address W-element) in the SETUP message sent to
the destination. If this suffix digit is omitted, the switch will assume the EAZ as 0.
Each type of outgoing call of the Omni TA128 can be assigned with one origination EAZ
by using the command AT&ZO x =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.
for Data;
for Data;
for the analog adapter, Phone 2;
for the analog adapter, Phone 1.
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