$ asterisk -rx "sip show settings" | egrep -i "extern|local|force"
Call to non-local dom.: Yes
  Jitterbuffer forced:    No
  SIP address remapping:  Enabled using externaddr
  Externhost:             <none>
  Externaddr:             79.134.194.182:0
  Externrefresh:          10
  Localnet:               192.168.10.0/255.255.255.0
  Context:                from-sip-external
  Force rport:            Yes

$ asterisk -rx "sip show peers" | grep 79.134.194.182
33/33                     79.134.194.182                           D  Yes        Yes         A  1025     OK (5 ms)
69/69                     79.134.194.182                           D  Yes        Yes         A  1024     OK (110 ms)
70/70                     79.134.194.182                           D  Yes        Yes         A  1026     Unmonitored

$ ip ro
192.168.10.0/24 dev eth0  proto kernel  scope link  src 192.168.10.16
169.254.0.0/16 dev eth0  scope link  metric 1002
default via 192.168.10.1 dev eth0