Paul Lacatus wrote:
I have an asterisk pbx conected to internet. I need to connect to asterisk a sip phone over the net that will be connected to the internet over a NAT router. I found on the net that SIP is not very NAT friendly. If somebody has a how-to for my problem please share it with me . Also any experience in this problem will be helpfull.

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Hi Paul,

in sip.conf

[123]
username=123
secret=123
type=friend
context=sip123
allow=all
host=dynamic
nat=yes
canreinvite=no
qualify=yes


The important ones are
host=dynamic - if the sip phone behind the nat is going to register on asterisk nat=yes - tells asterisk to not look to send packets back to the Ip in the SIP header, but the IP in the IP header
qualify = yes
canreinvite=no
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