Allow Callers to Transfer to Another Extension by Pressing 0 During a Voicemail Greeting

With our old phone system we would frequently include "press 0 to speak with someone if you have an urgent issue" in our voicemail greeting. This way if they were calling their primary contact and weren't able to speak with them they could easily be transferred to another extension (typically our reception call group) so they could speak with someone instead of leaving a voicemail.