Presently using a Metaswitch 3510, converting to a RedCom HDX. Problem is that my TA9XX units are replying to the HDX messages and registering to the new switch even though nothing about the HDX or subnet is not configured anywhere in the TA9XX. Occam has a setting for "MGCP Security" that prevents this. Looking to see if anyone knows of a similar function within the TA-Series IADs.