One way audio when paging outdoor intercom (CyberData)

I’m using Freepbx and I have a CyberData VoIP intercom Model 010935B. I have the outside intercom (CyberData) set to auto answer. When I page from the outside intercom station everything works great! But when I page the intercom from an extension the Cyberdata auto answers as programmed but only one way audio (No audio is being transmitted to the Cyberdata outdoor intercom) I’ve read about one way audio and asterisk and tried to troubleshoot. But if I page other extensions S500 phones, everything functions normally. I’ve changed the rtp port on the Cyberdata and still have the same issue. Any help would be very much appreciated!

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