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.
Website: https://www.techlicious.com/blog/how-to-prevent-spam-callers-from-leaving-voicemail/

When we call our friends and family, we often call and hang up without leaving a voicemail -assuming the missed call will be notification enough that we want this person to call us back. Even though this is acceptable to do in our personal lives, phone call etiquette in the corporate world plays by different rules.
However, keep in mind that your prospects might be faced with a lot more distractions at the beginning of the day. "The morning is the worst time to orchestrate a voicemail," says Zachary Weiner, CEO of Emerging Insider Communications. "Most decision makers have a lot on their plate when the day starts. Finding them when they have a bit more mind-share is often more conducive to a positive reply."