This page describes in more detail the call recording feature available in babblevoice.
From the main babblevoice console, call recording can be enabled for all calls in a domain.
The amount of space required is selected whilst enabling it. We estimate (which varied) that 16 hours of recording time can be achieved with each GB purchased. When the space is filled up, new space is created by removing the oldest files first. This will vary enormously depending on calling pattern and options selected (mp3 - smaller or wav, stereo or not) .
babblevoice stores cal recordings in Amazon S3 storage. We do this because:
Once stored, call recordings can be retrieved by the call records gadget in Netvibes. When a request is made, and url is passed down to your browser which is available for 4 hours. The Netvibes gadgets can download or play in the browser. Access control to call recordings are managed in the users section of the babblevoice console.