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Sip trunk with cisco 2811 dont work!

Hi, i need help to configure a sip trunk

i have a cisco 3825 with CME and recently bought a sip trunk with a local provider, but i cant get it works.. pls help

the provider said that The sip trunk dont have security, just this parameters to configure.

dir ip X.X.X.X Port 5060

its a openser no user no password.

so this is my sip configuration in the cisco router:

show run...

voice service voip

allow-connections sip to sip

allow-connections h323 to sip

allow-connections sip to h323

allow-connections h323 to h323

!

voice class codec 1

codec preference 1 g729br8

codec preference 2 g729r8

codec preference 3 g723ar63

codec preference 4 g711ulaw

codec preference 5 g711alaw

!

!

dial-peer voice 11 voip

destination-pattern T

voice-class codec 1

session protocol sipv2

session target ipv4:X.X.X.X

dtmf-relay rtp-nte

no vad

!

!

!

But when a called , just hear the busy tone...

and when i recive calls nothings happens

the router dont show any activity with the debug ccsip all, only when i make calls.

so pls, someone, what else have to do to configure ? something missing ?

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