Session Director - Respond locally to 18x

@status-line

I'm looking for a way to respond locally to 18x messages with a PRACK.  In my mind this would be similar to responding locally to an OPTIONS request. Am I even thinking about this correctly as a function of an HMR or should I be looking elsewhere trying to get this functionality. 

Something like this, but working.

sip-manipulation

      name PRACK181s

      description PRACK 181s

      split-headers

      join-headers

      header-rule

           name               isStatus

           header-name        @status-line

           action manipulate

           comparison-type    pattern-rule

           msg-type           reply

           methods

           match-value

           new-value

                element-rule

                name                 is181Code

                parameter-name

                type status-code

                action               reject

                match-val-type       any

                comparison-type      pattern-rule

                match-value          181

                new-value            200:"OK"