PBX Startups

Dial Source, founded in 2005 by Josh Tillman as a college project, evolved from a research paper into a leading enterprise communications platform native to Salesforce and Microsoft Dynamics. The company grew to multiple millions in ARR before raising any funding, and has since raised $7M to expand its team and product offerings. Currently serving over 20,000 seats across enterprise clients with $1-2M in monthly recurring revenue and 121% year-over-year ACV growth, driven primarily by conferences and a strong land-and-expand strategy.

People.ai is an enterprise SaaS platform that uses AI to help sales teams capture all their activities and provide actionable insights. Founded by Oleg Roginski (who previously bootstrapped and sold Cementria, a sentiment analysis API, for $5M ARR), People.ai achieved ~100 logos in 45 days before Y Combinator demo day through intensive customer development and outbound sales, eventually moving upmarket to work with large enterprises and public companies.