T46S voicemail key not working (off hook)

[CharlieKSDG]

I have received a report of this issue as well. Tried reproducing the issue on some of our own devices and would like to share my results. I just so happened to have 2 T42S devices with the old and new firmware here with me.

Issue Description:
Voicemail Key not responding when handset is off the hook. When Handset is on the hook, voicemail works on speaker. Handset can be lifted after initiated through speakerphone.

Reproduction Steps:
Lift handset off of cradle. Press "Message" button. Phone should connect straight to voicemail extension.

Results:
- SIP-T42S (66.83.0.55) - Voicemail Connected
- SIP-T42S (66.84.0.35) - Non Responsive
- SIP-T46S (66.84.0.35) - Non Responsive
- SIP-T48S (66.84.0.35) - Voicemail Connected