Echo Test

An echo test is a function that repeats what you say. This gives you the ability to verify any latentancy and the bandwidth quality to Asterisk. Make sure you also check out DTMF Echo Test

;Echo Test
exten => 12,1,PlayBack(demo-echotest)
exten => 12,n,Echo()
exten => 12,n,PlayBack(demo-echodone)
exten => 12,n,PlayBack(goodbye)
exten => 12,n,HangUp