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Cisco's WebEx Social has a highly capable iOS client (5 out of 5 stars currently) that can do video calls. Surprisingly, an Android version is not available.
IBM's Connections platform has evolved over the years to become a leader in many areas of enterprise collaboration.
IBM Connections has rich support for iOS mobile clients (4.5 out of 5 stars) and Android devices (4.5 out of 5 stars)