Got the MOH file from the customer, they convert is to G711u in .wav then in .au files format.
When We put it in production (SRST sending the feed to the phone in a remote site). The Music quality is VERY bad, crispy.
Like if CCM was requesting the phone to connect to a G729 device, and MOH send out G711u.
With the Cisco music-on-hold.au sample file, the quality is good.
The file is 40Mb on a USB key attached to the 2811 Router.
Is the size an Issue ?
Another test, using the .wav format make the music play correctly but this was VERY slow, like 2 times slower than normal.
Is the usage of USB Flash can be my root cause ?