I am using Asterisk as a voicemail server for my SER environment. Once in a while IP based calls into Asterisk experience intermittent "robotic" or stuttered sounding audio. This happens with both greeting playback and message playback. The SER calls crossing the same IP network do not experience this problem at the same time Asterisk calls do. Are there parameters specific to this type of call that I should check to address this issue? Thanks,Steve