Apoogies if this post is in the wrong area - I'm new here.
I have 12 Polycom VVX400 phones in a small office on two floors. I had "presence" enabled so that we could each see who was on calls on the resepctive floors. Around 2 months ago - an issue arose with the presence funtion enabled whereby we had only one way audio with callers. I had to remove the presence funtion from all the phones to restore two-way audio. One-way audio returns as soon as I try to set up presence again but we really need this function to work as it had done for around ten months without any issues.
Any help would be appreciated since our service provider seems clueless as to how to reslove this.
Steve