“Hi! You have reached [your business]. All of our staff are currently busy helping other callers. We understand how valuable your time is, and rather than keeping you on hold, we will make sure to call you back.Be sure to leave us a detailed message with your name and number. We will return your call within two business hours. Thanks!”
Listen to your messages and return your calls as soon as possible. Of all the lines of communication available (social media, text, email, etc.,) your callers resulted in picking up the phone to call you because they wanted to speak with a live person. Do them the common courtesy and give them a call back when you first have the chance.

In Australian English it’s pronounced with the vowel /a:/ like in ‘part’. Problems arise when people use the /ʌ/ vowel (like in ‘up’) instead of /æ/ or /a:/. If you do this is will sound like the worst swear word in English. Many non-native speakers often pronounce the vowel /æ/ more like /ʌ/ because they don’t have a vowel like /æ/ in their first language. Many speakers of European languages will do this (Spanish speakers and Italian speakers) and also speakers of Japanese and Korean. This problem with /æ/ also means that if you say the word ‘back’ in your voicemail greeting sample, you are likely to pronounce it more like ‘buck’. remember to pronounce word endings in English. Check you aren’t dropping any endings off or mispronouncing them.
1.) You are connected to the mailbox of John Doe. Currently Mr. Doe can not be reached. You can call again at a later time or leave a message with your name and phone number that Mr. Doe can call you back as soon as possible.