Why a HMR could generate a call is cut after about 30 seconds?

HI

I created a HMR that evaluates if the ANI code begins with 403, and has a length of 8 digits in total.

If the EVALUATION is correct, I deny the store value changing to a true just what is not 403 prefix.

thus only allow ANI starting with 403 if I do not reject a 603 and a message of " Error ANI "

The evaluation seems to be good and do what I need but once established called the SBC continues to send multiple messages SDP 200 OK
until it sends a bye to the origin of the call

My HMR

sip-manipulation

        name                           TEST

        description                    Prueba