Well the service is not free for ever and only available for 12 months for new subscribers (BYOD ATA or Softphone) and only to certain areas in Canada.
There are hardly any strings attached except for the following:
1. Users are obliged to write a small review about their current service with Acanac on any Voip or DSL related review web site.
2. Users must include a link to their review in the comments section of Acanac's order form.
The order form: https://www.acanac.com/cgi-bin/acanac.cgi/Free-Voip.html
* Important: Please note that there is no termination outside those calling areas. You can call from Toronto to Montreal or Ottawa to Toronto but you can’t call outside those calling areas. If you wish to call outside those areas you would need to subscribe to their paid service.
* One order per person
These accounts auto expire after the 1 year term. If you wish to continue service you must contact Acanac before the free 1 year is over.
Well worth a try for the first 500 applicants!!