ZyXEL Communications omni series user manual AT Commands Description

Phone 1	Phone 2	Global Call	S120.2	AT&Ln
MSN	MSN	(No Called	(Default=0)	(Default	Phone 1	Phone 2
Matched	Matched	Party No.)		n=0)
ü	û	û	-	-	Ring	-
û	ü	û	-	-	-	Ring
Unassigned	Unassigned	û	0	-	Ring	Ring
Unassigned	Unassigned	û	1	n=0	Ring	-
Unassigned	Unassigned	û	1	n=1	-	Ring
ü	ü	û	0	-	Ring	Ring
ü	ü	û	1	n=0	Ring	-
ü	ü	û	1	n=1	-	Ring
û	û	û	-	-	-	-
-	-	ü	0	-	Ring	Ring
-	-	ü	1	n=0	Ring	-
-	-	ü	1	n=1	-	Ring

The default MSN sub-address (or EAZ) for 1TR6 (Old German ISDN) of the a/b adapters are as follows:

∙Phone 1: EAZ = 4 (&ZI7=4)

∙Phone 2: EAZ = 3 (&ZI6=3)

A global call is an inbound voice call without the information of destination phone number (Called-Party-Number) which happens more often than not on some switches when the calling site is on the PSTN (analog telephone). By default, the TA will route the global call to both the POTS ports (make them alert). The one that picks up the phone earlier answers the call.

AT Commands	Description
ATS87.0=0	Enable POTS port 1 to accept global
	calls.(Default)
ATS87.0=1	Disable POTS port 1 to accept global calls.
ATS87.1=0	Enable POTS port 2 to accept global
	calls.(Default)
ATS87.1=1	Disable POTS port 2 to accept global calls.

74 Handling Analog Calls (non-data)