You can purchase a local or a toll-free numbers in Freshdesk. If you are using a local number (currently available in 36 countries), then your users will be charged the regular call tariff as per their network provider.

In case you have purchased a toll-free number (currently available only in US, UK, Canada and Australia) your users not be charged for the call. However, if a cross country call is made then the regular call rates as specified by their network provider applies.