For the ent-sip-npp command, the SIP prefix should be unique for a phone-context. Prefix value can not be duplicated for the same phone context.
Recovery
Enter the rtrv-sip-npp command to display the currently provisioned rules.
Reenter the command that generated this error message, using a unique SIP prefix value and specifying a valid combination of parameters. Refer to the command description in the Commands User's Guide and Database Administration - Features User's Guide for assistance.