If you are experiencing voice issues while running AOS R13.8 or R13.9, ADTRAN recommends the following:
If you don't require a feature that was included in the AOS R13.8 or R13.9 firmware release, ADTRAN recommends using AOS firmware version R13.7.1 for the most stable
experience currently available.
If you require a feature that was included in the AOS R13.8 or R13.9 firmware release, ADTRAN recommends contacting Customer Support to discuss the appropriate next steps.
