I know this much. the CBSA is on this system. I do not however know which talkgroup they use.
"The Canadian Border Services Agency uses two-way radios on the city’s system but border officers haven’t reported any problems, an agency spokesman said."
"Commissionaires providing security at RCMP facilities are on the city’s radio system, but the radios are still on the old system and have not experienced an outage, an RCMP spokeswoman said."