Cisco Router 4421 with TTY Lines commands to show Connected and Disconnected lines

[Yasmeen]

Hi Team

             We are using Cisco ISR4421 Router is using with two NIM Modules 

             Using this NIM modules we have 48 TTY Lines Connected with Modems 

             I need to check how many TTY lines connected and Disconnected 

             Do we have any commands to check the connected and Not Connected TTY Lines ?

             Please let me know the Commands ?

Show Sessions not worked 

Show Users all not worked 

What is the Commands for TTY lines Connected and Not connected to check ?