Add prefix before calls?

[alivoiper]

Is there a way to add a prefix before all calls on one SP only? Ie I have SP1, SP2 etc and want to add call blocking (ie *67) on only one of the SP lines.

Thank you

[drgeoff]

Is there a way to add a prefix before all calls on one SP only? Ie I have SP1, SP2 etc and want to add call blocking (ie *67) on only one of the SP lines.

Thank you

Should be possible.  How are you telling the OBi which SP to use on each call?