How to make comparison and replacement dynamically for list Request-URI using HMR ?

Hi Friends,

I am using Acme Packet Net-Net 3820 SCZ7.4.0 Patch 3 (Build 152) and need assistance with modifying the Request-URI in the INVITE header using HMR

I have 634 toll-free numbers, which are mapped to 57 DNIS numbers by the Telco. Each DNIS number corresponds to a group of toll-free numbers that route calls to it.

Requirement:

I need to filter incoming INVITE requests based on the Request-URI and replace them with their corresponding DNIS numbers.

Example:

Original INVITE request:

INVITE sip:800409237@10.2.2.6:5060;transport=udp SIP/2.0

Desired transformation:

INVITE sip:555555810@10.2.2.6:5060;transport=udp SIP/2.0

This transformation needs to apply across multiple Request-URIs based on the mapping of toll-free numbers to DNIS groups.