What are some alternatives?
When comparing RingCentral and Sparta, you can also consider the following products
Nextiva - Business VoIP, cloud phone systems trusted by more than 150,000 companies. Powered by the leading cloud PBX VoIP platform, Nextiva is rated the best business VoIP service provider.
Close - A CRM with built-in calling, SMS, and email
FluentStream - FluentStream Technologies is an advanced telecommunications company with a core focus on cloud-based applications.
SalesWise - A gorgeous launchpad for sales people
Bitrix24 - Bitrix24 is a free (for small businesses) social enterprise platform. It is a united work space which handles the many aspects of daily operations and tasks. Create your own social intranet in minutes!
Hoopla - Your public library at your fingertips.