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.
If your recording is vague, confusing, or drags on, customers will lose interest and hang up the phone instead of leaving a voicemail message. To help you create an effective after hours announcement, here are some best practices and sample scripts you can employ.

If the you haven't changed your personal greeting, a default system greeting will be played for callers. For example, "Please leave a message for John Smith. After the tone, please record your message. When you finish recording hang-up or press the pound key for more options."
7. Password protect your voicemail. There are reports of voicemail being hacked, so protect yourself and your clients by adding a password. If you can dial in from externally to pick up messages, you should have an option to add password and on a mobile, there should be a password option in the menu.