I wonder if someone could confirm what the 8845 buttons on the right hand side do by default, and also if and how they can be customised if we don't select "Enhanced Line Mode" I don't have one of these phones to hand to play with, but from information the customer has sent the two top right buttons have some sort of default function.
If I understand it correctly then changing to "Enhanced Line Mode" means these five buttons can be configured as normal in CUCM admin, and in this case I'd like to retain those original functions (whatever they are) but allow the other three buttons to be used for speed dials.
Yes, by transforming the Cisco 8845 to ELM you are able to have 5 more buttons on the right side available for all kind of features such as, speed-dials, DNs, BFL and Speed-dial or SURL (services). Based on my experience, usually users need the right side to add more speed-dials but by doing so they miss the Call History key (the clock), which provides information about Missed Calls or All Calls.
Since this key cannot be available on the ELM mode, the easiest way to replicate it is to create a new Service (Application:Cisco/MissedCalls) and assing a SURL key on the right side to allow the users to check their missed calls anytime.
Hope this helps,
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