No application 'Dial' for extension error in Asterisk

Question

I have three extensions with extension no. 2000 , 2001 , 2002 .Separately i am able to call from one extension to another. While calling the any extension it getting error like this No application 'Dial' for extension error in Asterisk

My sip.conf like this

[general]
port = 5060
bindaddr = 0.0.0.0
context = others

[2000]
type=friend
context=demo
secret=1234
host=dynamic

[2001]
type=friend
context=demo
secret=1234
host=dynamic

[2002]
type=friend
context=demo
secret=1234
host=dynamic

and extensions.conf

[demo]
exten => 2000, 1, Dial (SIP/2000)
exten => 2000, 2, Voicemail (u2000)
exten => 500, 1,Answer()
exten => 500, 2, playback(demo-echo)
exten => 500, 3, Echo
exten => 500,5,Hangup

exten => 2001, 1, Dial (SIP/2001)
exten => 2001, 2, Voicemail (u2001)

exten => 2002, 1, Dial (SIP/2002)
exten => 2002, 2, Voicemail (u2002)

please help me how to resolve this issue.Thanks in advance

Answer 1

Funny, but...

You said you got error No application 'Dial' for extension (...) , but due to your dialplan (and due to what I have tried) you should have got No application 'Dial ' for extension (...)

So, try this dialplan, where all unnecessary blanks are removed:

[demo]
exten => 2000, 1, Dial(SIP/2000)
exten => 2000, 2, Voicemail(u2000)
exten => 500, 1,Answer()
exten => 500, 2, playback(demo-echo)
exten => 500, 3, Echo
exten => 500,5,Hangup

exten => 2001, 1, Dial(SIP/2001)
exten => 2001, 2, Voicemail(u2001)

exten => 2002, 1, Dial(SIP/2002)
exten => 2002, 2, Voicemail(u2002)