Create a speed dial and use , (comma) for 1 sec delay. i.e 918005551212,1234
Here is the link for CUCME but it works the same in CUCM 10.5.
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/admin/configuration/guide/cmeadm/cmespeed.html
Search the page for the word pause.