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.
It may sound silly, but the tone in which you say something can either play the professional status up, or it can bring it down. You can’t change what your voice naturally sounds like, but you can work on controlling it to make sure you sound calm and collected when recording your message.

The easiest way to record and program professional voicemail greetings for your phone system is to write down a script. Choose someone to record your script - the one who can speak without hesitating or stuttering, has a friendly voice and can annunciate and pronounce each name and word clearly.
After you recognize yours and your customer’s pain points, it will be much easier for you to classify what instructions that you need to mention in your business voicemail greetings. Modifying your calls to action will help to make a big difference in eliminating pain points and enhancing the customer experience.