Add a dial plan ext with speed dial button

Jiveon thanks for your feedback here, we will pass this on to the team. 

This is super important.  Currently, our operator uses a physical VOIP phone with a sidecar with speed dial extensions.  Our salespeople are set up with individual dial plans and individual queues and the operator forwards calls to their dial plan extension.  If the ability to speed dial to a dial plan extension goes away, this would severely cripple our operator's ability to do her job.  This would become a critical issue!