Local exten

Hi all

I am calling local extension to Local exten

eg.100 to 101

I was monitored in Asterisk call is dialing
but can`t hear ring tone .
why?
can you explain me?

Not without a lot more information.

pls check my conf

[local]
exten => 100,1,Dial(SIP/100,20)
exten => 100,2,Voicemail(100@local-vm-users)
exten => _X.,1,Dial(SIP/${EXTEN}@Outgoingtrunk1)

exten => _1XX,1,Answer()
exten => _1XX,2,Dial(SIP/${EXTEN},10)
exten => _1XX,3,Voicemail(${EXTEN}@local-vm-users)
exten => _1XX,4,Hangup

[local2]
exten => 101,1,Dial(SIP/101,20)
exten => 101,2,Voicemail(101@local2-vm-users)
exten => _X.,1,Dial(SIP/${EXTEN}@Outgoingtrunk2)

exten => _1XX,1,Answer()
exten => _1XX,2,Dial(SIP/${EXTEN},10)
exten => _1XX,3,Voicemail(${EXTEN}@local-vm-users)
exten => _1XX,4,Hangup

sip.conf?
network topology?

plot the CLI output as well.