Best practices/thoughts: How do talk users manage a significant number of lines?

Our business has a growing number of lines in Zendesk Talk and agents are experiencing a pain point in scrolling to the right number.

Our use case is that we serve families nationwide and outbound on a local number for approximately 10 specific areas at this time (and growing). This also allows inbound calls from these families to be routed to the right voicemail and team.

I would love if the call bar functioned as the ticket form does - where the agent can begin to type and see a filtered drop down in the field. *hint hint* for product development! 

My question is, do any other Zendesk customers out there have a significant number of lines (15+) and do you have any tips on managing them? Thank you in advance.