The E911 network in Ontario and Quebec is run by Bell Canada. The PSAPs may have non-emergency lines that are provided by other carriers. At 03:56 PM 08/07/2022, Andrew Paolucci via NANOG wrote:

I believe the call centers run by law enforcement and municipalities in the GTA are mostly homed on single providers, I know some Bell and Telus users in certain areas are still able to reach emergency services.

Regards,

Andrew Paolucci

-- Clayton Zekelman Managed Network Systems Inc. (MNSi) 3363 Tecumseh Rd. E Windsor, Ontario N8W 1H4 tel. 519-985-8410 fax. 519-985-8409