Sample Asterisk to help you configure our numbers
extensions.conf:
[from-trunk]
exten => _X.,1,Ringing
exten => _X.,n,Answer
exten => _X.,n,Echo
exten => _X.,n,Wait(600)
exten => _X.,n,Hangup
sip.conf:
[trunk-us]
host=46.19.209.14
dtmfmode=rfc2833
dtmf=rfc2833
type=peer
context=from-trunk
insecure=very
nat=never
allow=all
[trunk-eu]
host=46.19.210.14
dtmfmode=rfc2833
dtmf=rfc2833
type=peer
context=from-trunk
insecure=very
nat=never
allow=all
iax.conf:
[trunk-iax-us]
type=user
permit=46.19.209.42
context=from-trunk
[trunk-iax-eu]
type=user
permit=46.19.210.42
context=from-trunk
Here are the IP addresses for your software/firewall etc.