Direct to voicemail transfer with BLF in asterisk - T46G

[nicknomo]

We are looking to simplify transferring directly to voicemail. I'm using the T46g.

Lets say you have an operator (Sara) at extension 200, and want to transfer to the voicemail of extension 221 (Tony). In asterisk, the way to do this is to transfer the call to *221.

Right now my BLF's have the value of the extension number. Extension 221 BLF has a value of 221.

What I'd like to do is set up a direct to voicemail button (transfer + *), and use a BLF to choose what voicemail to go to (e.g. 221).

I can hit transfer than the BLF, but I can't even do transfer * than the BLF (a normal transfer occurs). I also can't use DTMF to do ##* than hit the BLF button. A normal transfer also occurs

If I hit transfer, and manually type in *221, it transfers to voicemail fine. I can also manually type in ##*221, and it also transfer to voicemail fine.

Is there any way to get this done where I have a DSS key and BLF key work together to do this?