Most clients want a “transfer to voicmail” button. I don’t know why Avaya doesn’t just make this a simple feature. Regardless, I could not get this to work. I’ve done it a 100 times, but still no luck. It seems that there might be something wrong with 4.2 and specifically build 4. More than likely, your IP Office 406v2 already has build 5 ready to upgrade. You can check by:

File -> advanced -> upgrade

You will see any available builds. BUT WAIT: before you do the upgrade, make sure your phones are prepared for the firmware upgrade. Your phones, in my case usually a 5410, will get it’s directive from the NoUser profile. Simply go in this profile and add a new source number:

ALLOW_5410_UPGRADES

Now you can go back to the system upgrade in the first step above. After that is complete, you can add the short code:

Code: #XXX
Feature: Voicemail Collect
Tel Number: “#”N

That should do it.