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Problems with VoIP Calls, busy tone (PBX and Router)

I have a VPN Point to Multipoint, each point is using two VoIP port.

The core is using 6 voice ports, the problem is that the last two port that I added they aren?t working.

I have the same configuration for all:

A) voice-port 3/3

timeouts call-disconnect 1

connection plar 8157

B) dial-peer voice 100 voip

destination-pattern 8157

session target ipv4:X.X.X.X

dtmf-relay h245-alphanumeric

no vad

C) dial-peer voice 10 pots

destination-pattern 8157

port 3/3

forward-digits all

prefix ,,

But, these two last port send a busy tone, i can?t dial.

The users call to these lines, they are sending to VPN locations, you can see next:

Extension(8157)-PBX-Router-VPN-Router-Extension(8157)

Do you know where the problem is ?

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