This the trunk configuration that I used to make dial through a Cisco UC520, UC540, UC560 or Cisco CME phone system. Notice the two 9’s    _991NXXNXXXXXX . Vicidial discards one of the 9’s and Cisco remove the other and passes 10 digits to your carrier.

[uc520]
type=friend
context=outbound
host=10.1.1.1
allow=all
nat=no
canreinvite=yes
qualify=yes
insecure=very

exten => _991NXXNXXXXXX,1,AGI(agi://127.0.0.1:4577/call_log)
exten => _991NXXNXXXXXX,2,Dial(SIP/${EXTEN:1}@uc520,,o)
exten => _991NXXNXXXXXX,3,Hangup

 

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