P325 cutting out the beep on outgoing calls to voicemail

This is a weird one and believe it is phone related as we dont have this issue at any site using the S series phones. As the title states when making an outgoing call and you reach a voicemail you hear the greeting but never hear the beep itself. I can make a call to the same number from one of this customers other sites using the same hosting and sip trunking and S phones and it works fine. And it seems to be happening about 95% of calls.

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