There could be a number of reasons for call quality issues. Examples would be poor internet connectivity, or local network issues. We recommend contacting your ISP. If that is not the problem, or if the problems persist, open a TAC ticket. Please contact TAC for further assistance: Phone Support: 800-553-2447 (U.S) 1-240-720-9500 (CAN) + 44-203-771-1808 (UK) 1-240-364-9234 (Global) Global Support … Read More
See the Cisco Calling Service Privacy Data Sheet.
G711 = standard quality (no compression), G722 = HD quality , and G729 = lower quality. Default is set to “auto-negotiate.”