====== Timers ======
  * Busy timeout
    *  Sets the length of time after which calls that are transferred to busy destinations are disconnected. 
  * Interdigit timeout
    * Configures the interdigit timeout value for all Cisco Unified IP phones attached to the router. 
  * Ringing timeout
    * Sets the duration, in seconds, for which the Cisco Unified CME system allows ringing to continue if a call is not answered. Range is 5 to 60000. Default is 180. 
  * Keepalive
    * Sets the time interval, in seconds, between keepalive messages that are sent to the router by Cisco Unified IP phones

===== Configuration =====
<code>
telephony-service
  timeouts busy <seconds> 
  timeouts interdigit <seconds> 
  timeouts ringing <seconds> 
  keepalive <seconds> 
</code>