well, no need to call CC, procedure for dynamic STD/ISD/Local call locking is listed on their website, it works exactly like mentioned on the website, have been using it for quite some time now.
Secure your phone calls. Dynamic lock allows you to lock STD/ISD and local calls selectively with a password.
To register your dynamic lock password, Dial 123 followed by 0000, and then your new password and #
To change your password dial 123, followed by your old password and then new password and #
To activate the Dynamic Lock, dial 124 followed by your password and the service code as defined below.
For Fixed Line Numbers beginning with 49, dial 124 followed by *, then followed by your password – and then the service code as defined below.
0# : all calls allowed
1# : Lock STD/ISD
2# : Lock Trunk and Premium Calls
7# : Lock Calls to Mobile, Wireless Lines and 95 numbers
4# : All calls locked.
Airtel Landline Services: Other Services