July 2020, ProCall 7 Enterprise

Holding a call is based on Android ConnectionService in ProCall Enterprise.
Therefore you can easily activate the function "Hold call" by using  and retreive the call from hold by using .

Function availability

The availability of the function depends on the Android version, system environment, configuration and the supported features of the telephone system. In ProCall Enterprise the function is released from version 7.0.12 of the Mobile App and from version 7.0.1 of ProCall 7 Enterprise.