Thank you for your responses. This happened at home office in an excellent signal area and on WI-Fi calling. Using a ZTE. Discussed this issue with tech. several times. Finally received an answer that seems to be working. Will get back if not. Apparently, having my Connection preferences setting to Wi-Fi preferred was (maybe) causing this situation. Tech asked me to place setting on Cellular preferred which uses Cellular Network for calls. If Cellular unavailable, use Wi-Fi. Makes sense, I guess, since I am in a very strong signal area. However, my Wi-Fi signal was also strong, so I do not know why that would cause a busy signal for callers. In any event, calls seem to be going to voicemail now when I am unable to answer instead of a busy signal. On my android:Go to: Settings>More>Wi-Fi Calling>Cellular preferred
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