Hello Steve,
Thanks for posting to the forum. There might be some specific docs depending on what exactly you are trying to debug. I believe we have information on PPP and VPN for example. Voice debugs like SIP and PRI (isdn l2-formatted) are standard and non-ADTRAN proprietary. Debugs like voice verbose however are ADTRAN specific. You can get voice debugs questions answered by opening a support ticket, but I do not believe we have any line by line explanation on a topic like that.
With all that being said, what specifically are you looking for? Maybe I can help locate something to help you out.
Thanks,
Geo