BTW; Tomoo is aware of this issue (CCA 1.9/SIP Trunk). The error comes up when I configure a UC520 router for SIP Trunk (Cbeyond) service. Basically, immediately after the voice parameter config read completes, the error show up in the Devices window and the SIP Trunk turns red indicating error. If I switch to CCA 1.8, there's no problem and I can continue configure the SIP Trunk and register with the ISP.
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...