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.
Since a majority of your calls will go to voicemail, it’s essential to have more than one message to leave. If you repeat the same message over and over, it seems like you don’t care enough to put some effort into attracting the prospect. It doesn’t need to be significantly different than you first message, but it should be different enough to be noticeable and so it doesn’t just sound like boilerplate language.

Your voicemail needs to have relevant information such as your name, who the prospects are connecting to, the department you work in, why your not available to assist your prospects, when you will call them and related information, this is what the prospects would prefer hearing instead of dragging the voicemail messages speaking about your brand and more.
In a concise fashion, you should relate the hours your business functions, and note any potential conflicts such as holidays or business closures. Use an auto attendant if you have more than one menu option for the customer, such as a voicemail box and an emergency support line.