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Configure the required RS-232 interfaces:
esr-21-2(config)# interface serial 1/0/2
esr-21-2(config-serial)# ip address 1.1.1.2/24
esr-21-2(config-serial)# exit
esr-21-2(config)#
Configure firewall for security zones:
esr-21-2(config)# security zone xx
esr-21-2(config-zone)# exit
esr-21-2(config)# security zone-pair xx self
esr-21-2(config-zone-pair)# rule 1
esr-21-2(config-zone-pair-rule)# action permit
esr-21-2(config-zone-pair-rule)# enable
esr-21-2(config-zone-pair-rule)# exit
esr-21-2(config-zone-pair)# exit
esr-21-2(config)#
Specify that the interfaces belong to the security zone:
esr-21-2(config)# interface serial 1/0/2
esr-21-2(config-serial)# security-zone xx
esr-21-2(config-serial)# exit
esr-21-2(config)#
Objective 3:
Use additional modem settings for Objective 2
for modem 1 enable the V.22bis protocol
disable the speakers on both modems
Solution
Create a line with additional modem initialization parameters for the first ESR-21, where
AT&N1" – enableV.22bis on modem mode
ATM0L0 – disable modem speaker
esr-21-1(config)# chat-script dial_test "ABORT 'BUSY' ABORT 'NO CARRIER' ABORT ERROR '' AT OK
AT&F OK AT&N14 OK ATM0L0 OK ATD\\T CONNECT ''"
esr-21-1(config)#
Enable the use of the modem initialization string:
esr-21-1(config)# interface serial 1/0/2
esr-21-1(config-serial)# dialer string 001 modem-script dial_test
esr-21-1(config-serial)# exit
esr-21-1(config)#
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