Hello & Welcome to Just Answer,
Sorry I didn't see your question earlier and to hear of any issue you are having with your phones.
To help you with this issue, may I ask:1) The Make & Model Number of the phone system you are working with? That model should be printed on a sticker on the bottom or back of the main base unit of the system.
2) What phone service provider (phone company) you have for this phone line?
3) When you say "need to get the Voicemail", is there any indication of messages being left on the system?
It looks like you MAY have opened a new question - instead of replying back here. Please try to come back to this page and respond here.