Optional Bluetooth module (specification BT 2.1 + EDR, class 1) for system telephones ST 5x (IP) for connecting Bluetooth headsets. Supports the headset and hands-free profile. The maximum number depends on the ES system used and corresponds to the maximum number of ST 5x devices! The BT module 50 requires the current ES system firmware version at the time of delivery and is supported in the device types ST 53 (IP) and ST 56 (IP).
