ist there any way to get rid of this permanent dizzy noise? IP phone is connected to local asterisk server, calls are going through SIP provider, codec g711u. Other equipment even dect phones (over sip-adapter) have no such effect, so it's phone related. It's not loud, but if you know about it - it's there and really annoying.
Silence support is disabled. Decreasing handset volume does help, but not really a solution for normal working environment.
Configure Multicast Paging on the Cisco IP Phone 7800 Series or 8800 Series Multiplatform Phone
The Cisco IP Phone 7800 and 8800 Series Multiplatform Phones provide voice communication over an Internet Protocol (IP) network...
Add Call Park on a Cisco 7800 or 8800 Series Multiplatform Phone Key Expansion Module
Call park allows the user of the phone to put an incoming call on hold so that the call can be retrieved on another phone. A call is park...