Don' let background noise do the talking for you. Ambient noise on your recording could be sending the wrong message to your clients. The sound of your kids arguing in the distance could be the sign of a distracting work environment. Clinking glasses and restaurant chatter may leave the impression that you don't take your work seriously. When you record your voicemail greeting choose a quiet spot free from interruption, so your message is the only thing callers hear. It's also good to avoid large, cavernous spaces where sound verberates.
You can customize each greeting for each phone number within your OpenPhone account. In addition, you can change it as often as you need.

8. “Thanks for calling [your name] at [your company]. I didn’t mean to send you to voicemail but I am either on the line with another client or on the go. Leave your name, number, the reason for your call today and the best time to call you back. I’ll speak with you shortly! ” Your caller probably wanted to reach you, not your voicemail. Advise your caller that you’re simply on the line with another caller and you’ll be right with them.
Another worth considering trick is to remove all the old voicemails that are consuming the storage and creating multiple dilemmas like this. To delete the voicemail here are the steps, Open the Phone app. Tap on Voicemail at the bottom tab. Then tap on Edit at the top-right screen. Select All the Voicemails and at last tap Delete.