AT&T is a US-based telecoms company, and the second largest provider of mobile services and the largest provider of fixed telephone services in the US.
BroadSoft, a part of Cisco, is the leading provider of software and services that enable mobile, fixed-line and cable service providers to offer Unified Communications over their Internet Protocol networks.
Truly is an all-cellular business phone solution offering professional call quality, conversation tracking, and CRM integration for iOS and android devices.