- BlackBerry® smartphones
UMA (Unlicensed Mobile Access) is provided by some carriers as a secure method to connect to their wireless network to make phone calls over Wi-Fi®. However, the Quality of Service (QoS) that is normally managed and ensured by the wireless carrier over their network cannot be guaranteed over every Wi-Fi network even though BlackBerry® smartphones support guaranteed QoS values.
The quality of a call placed through a UMA connection is only as good as the weakest segment of the transport path between the smartphone and the carrier. A BlackBerry smartphone uses the "best effort" setting to allow it to attempt a call over a Wi-Fi network even though that network may not have support for QoS. Therefore, to ensure best results any UMA-capable smartphone will always defer to the capabilities of the network infrastructure it is connected to.
There is no access to the QoS settings on the BlackBerry smartphone and a BlackBerry Enterprise Server has no control over or awareness of the native UMA functions of connected BlackBerry smartphones. Access to QoS settings is provided by the BlackBerry MVS system through the BlackBerry MVS client.
See KB24907 for more details on QoS for VoIP (Voice over IP) and Voice over Internet applications.
See KB25405 for more details on QoS settings for non-voice applications.
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