I am attempting to connect an OBI312 to a Valcom V2924 Page Control. I have registered the OBI 312 and can call it and the call is answered by the FXO port which will then allow me to send digits to the Valcom V 2924 Page control. The problem comes when i complete the page and hang up the calling phone. The FXO port and the Valcom 2924 do not disconnect from each other so i can call back in to make another page. The only option i have found is to un plug form the Valcom Device. Any Suggestions???