From firmware version 10.1.54.0 and forward, any phone with USB Recording Feature can record a phone call to an attached USB drive in WAV file format. If the setting usb_storage_passphrase is set, the audio will be encrypted while recording.
Audio file encoding
The audio file is recorded using these specifications:
Playback of WAV files stored on a USB drive is possible provided the file encoding as above and no special characters in the filename. Any of the following special characters included in the filename will prevent the filename from being displayed: comma, /, \, #, ;, :, |, %, (, ), @, &, ?, ', ", *, >, <, and whitespaces.
On a USB Recording Feature supported phone, follow the next steps to be enable recording on a USB drive or playback previously recorded files from an attached USB drive:
Once enabled, two feature keys can be assigned to any programmable key but also will be automatically added to the soft keys when in a call. The feature control keys are Record and Pause.
With an active call, the typical operation is:
Below is a sample of the in-call keys with the USB Recording feature enabled, but not actively recording.
Actively recording will appear similar to the image below.
After pressing Pause, you have the option of Stop or Resume, as shown below.
With a phone that has the USB Recording Feature available and enabled (see Required Settings above), navigate to the USB Info page with the following steps:
Depending on the size of the attached USB drive you will see a screen similar to the image below.
With a phone that has the USB Recording Feature available and enabled (see Required Settings above), navigate to Browser Recordings with the following steps:
A list of WAV files will be displayed similar to the image below
Following the Listing Playback Files above, select the file you wish to play and press the Play soft key. See a sample image below.
The playback can be paused, deleted, or stopped.
When the file is not encrypted and actively playing Rewind and Fast Forward allow skipping forward or backward by 5 second intervals.
When encrypted and playing Rewind and Fast Forward do not appear, as skipping is not feasible with encrypted audio.