This tutorial shows how to adjust the MicroCell voice quality.
INSTRUCTIONS & INFO
If you are not satisfied with the voice quality on your MicroCell:
Run a speed test at www.att.com/speedtest to ensure your broadband connection meets minimum requirements of 1.5 Mbps download and 256 Kbps upload speeds. If necessary, upgrade to a higher broadband speed.
If your issue cannot be resolved via the troubleshooting steps provided, please visit AT&T MicroCell Help or call AT&T Support at 1-800-331-0500.