My main concern is that at the three remote sites which have the 881 and SPA880 if there is a drop in the link to the main site, will these sites still be able to make and receive calls using the PSTN lines on their local SPA880? Or will they be unable to do so because even if they are using their local SPA880 the traffic still needs to go to the UC540 at the main sie first.
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...