We got a call from a customer who said that calls were being dropped when someone paged. We worked with the customer to reproduce the issue and here is what is happening: One person is making an outbound call and hearing ringback as they wait for the call to be answered. During that time, someone else makes a page. After the page, the person making the outbound call hears silence and thinks that their call has been disconnected. In actuality, the're just not hearing the ringback. The call will complete as normal if allowed to do so.

The system in question is a 7400, but I have also reproduced this issue with a 7100. The extensions are all IP. The issue affects the extensions in the page group receiving the page. Other stations are unaffected.

I look forward to hearing your thoughts on this.