options—Set the options parameter by typing
options, a Space, the option name preceded by a plus sign (+) (reg-overload-protect), and then press Enter.
ORACLE(sip-config)# options +reg-overload-protect
If you type either of these options without the plus (+) sign, you will remove any previously configured options. In order to append the new option to the options list, you must prepend the new option with a plus sign as shown in the example above.
Note:
Note that the sip-config option "cache-challenges" (enabled by default) must not have been disabled for SIP Registration Overload Protection to work properly. If you have disabled cache-challenges, re-evaluate the reason you disabled it. If registration overload protection supersedes your reason for disabling cache-challenges, re-enable the option as shown below.