SuperG3 fax machines (high-speed fax or 33.6 kbps fax) must be configured to transmit and receive at 14.4 kbps. In cases where a SuperG3 fax machine communicates with a non-SuperG3 machine, fax calls may complete properly because the lower speed fax machine causes the SuperG3 to throttle down to a lower speed. If the machine speed cannot be configured, it may not function properly on Webex Calling.
While missed calls aren’t ideal, you can let your caller know you’re still there for them by having a great voicemail greeting. The best business voicemail greetings let your customers (and potential customers) know why you’re not available and how they can best get in contact with your business. They are also short and to the point. You usually want to keep your greeting between 6 and 24 seconds long so callers don’t hang up halfway through.

On the Phone tab, click the voicemail icon below the dial pad, and then click Change Greetings. Skype for Business calls your voicemail and guides you to record a personal greeting. When asked to press a number, pause on the phone/mic icon and click a number under the DIAL PAD tab.
Let the customer know that they're being served by a real person, and not an impersonal automated system. Ask a question. “How are you doing today?” “How may I direct your call?” “What can I do for you?” Whatever question you ask, it should let your caller know that you care, and are there for them.