Technical Reference for ZyXEL omni.net series 

8-15

The three levels of security used in conjunction with the security types are described in the 

following table. 

Level 1 

Level 2 

Level 3 

Password 
Check 

Yes Yes Yes 

CPN Check OK 
and S119.6=0 

N/A Call 

back 

CPN Check OK 
and S119.6=1 

N/A 

Keep the connection 

CPN  
nmatched 

N/A Disconnect 

CPN not 
Available 

N/A 

Call back using the 
corresponding pre-stored 
number 

Prompts the remote user to 
enter call back number  
for calling back. 

AT Commands 

[AT*G1] for Type 1 security 
[AT*G3] for Type 2 security 

[AT*G2] for Type 1 security 
[AT*G4] for Type 2 security 

[AT*G5] for Type 2 security 

Level 1 security 

Will only perform password checking. 
With Level 1 security, the local omni.net ISDN 
TA will maintain the connection if the password is 
matched, otherwise the line will be disconnected. 

Level 3 security 

Once the password is 
matched the local omni.net 
ISDN TA will prompt the 
remote user to enter a call 
back number. 

Level 2 security 

Provides Calling Party Number checking and Callback. The callback number is 
pre-stored in the password table. 

If the password has been matched (in a maximum of 3 tries over a 40 second 
time period) with its pre-stored password list, the local omni.net ISDN TA will 
check the Calling Party Number (CPN) against the pre-stored number 
corresponding to the password. If they are matched, the local TA will choose 
either to keep the connection or to disconnect and then call back according to 
the setting of bit 6 of S119: 

# 

S119.6=0

 - Disconnect and then call back. 

# 

S119.6=1

 - Keep the connection. 

If the CPN does not match with what is stored in the table, the local omni.net 
ISDN TA will disconnect the call. If CPN is unavailable in the SETUP message, 
the local omni.net will disconnect the call and then call back using the 
pre-stored number corresponding to the dial-in password. 

Table 54. three levels of security