For what it's worth (maybe someone else will wonder the same thing someday): You can lower/raise gain on an isdn trunk with the commands (issued on the isdn trunk itself):
rtp tx gain <value> rtp rx gain <value> |
May not always be the best way to deal with high/low audio levels--maybe something else is out of whack. But good to be aware of.
Thanks for the info
John Wable