During Operation Safety Net last April/May they had temporarily changed the policy wording on ME Tac 13E and ME Tac 14E to allow non LE PSAPs to have it installed on their consoles as they were using that instead of METCOM to provide PSAP to PSAP communications and also to allow the east and west MACC access as well. I presume this was a stop gap while they ferreted out the portables and mobiles that had METCOM installed still.
Full story is probably deep in the MESB TOC meeting notes.
As far as I can image, the only portables that should have them still are dispatch center back up radios for downtime or during relocation to a backup contingency center.