You call a client at her office. She doesn't answer the phone. Instead, you get sent to her voice mail. Her message says:
Hi. You've reached Misty. I'm not available to take your call right now, but please leave a message and I'll get back to you as soon as I can.
Use this phrase to identify yourself on a telephone voice mail message.
When you answer the phone in person, don't use this; it's too formal. Instead, say "This is ___."
When someone is "not available" to do something, it means that they can't do it; they're too busy, they have another appointment, or they're not allowed to do it.
In telephone messages, the phrase "I'm not available to take your call" just means "I can't answer the phone now."
"Taking" a telephone call means agreeing to answer it. For example, if someone calls your office, and your assistant answers, you can decide whether to "take" the call or not.
You can "leave a message" on voice mail. You can also leave a message with the person who answers the phone, if they're not the correct person that you want to speak to. If you call your sister's home phone, for example, and her son answers, you can "leave a message" with him. Later, he will give the message to your sister.
To "get back to" someone means to respond. You can "get back to" someone who sent you an e-mail or left a telephone message.
You can also use "get back to ___" to talk about answering someone's question later:
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