Enabling Call Waiting on Yealink T26P

[CarpeDiemTim]

Well, the good news is that the downgrade fixed the issue, but the bad news (sortof) is that apparently means I can't ever upgrade the firmware on her phone.

In particular, I was looking forward to the functionality that I believe is supposed to be included in the next release that would allow her to program a 'Direct to voicemail' button prefix/prepend button. In other words, she could press this button and then a BLF button to choose which users' voicemail to direct the call to. As it stands now, I've programmed the second page of her EXT39s with the switch button labeled "Voicemail" and just tacked on *4 to every extension that was on the first page. So as it stands now, she presses Tran+Voicemail (switch)+the user's voicemail button (*4xxx), then Tran again or just hang up, and it'd be nice if we cold cut that down to just 'direct to voicemail' + user's extension button.

Any advice on how I might be able to accomplish that if the newer firmware appears to be having issues with call waiting?