The Telecom Spot is a 3CX Platnium partner so you can rest assured you're getting the best product, price and service! 3CX pricing is based on the feature edition (standard, professional, enterprise) and the number of simultaneous calls a company needs. Usually, 1 sim. call per 3-4 extensions is required, i.e. a company with 50 extensions would need a 16 sim. call licence. See 3CX Editions Comparison to see which edition is the best fit for you! Try out a free 3CX license.
3CX offers both annual and perpetual licenses:
Annual licenses are yearly subscriptions and is priced based on the number of simultaneous calls required. You can upgrade your subscription at any point in time by just paying the difference for the remaining period.
Perpetual license prices includes maintenance for the first year, after which an annual maintenance renewal (fee) is required. 3CX maintenance entitles you to one year of updates, tested phone firmwares, security updates and the smartphone clients (which are licensed by year only and require valid maintenance).