I am using advertise in the listen interface for our NATed setup within AWS.

Using following listen statement in kamailio: -

version: kamailio 5.5.1

listen=udp:10.0.1.4:5060 advertise 3X.1XX.1XX.2XX:5060

dispatcher.list

1 sip:10.0.4.23:5060 8 10 weight=11 #FreeSwitch 1

We are seeing that kamailio (10.0.1.4) is sending

two SIP INVITEs via dispatcher to FreeSwitch at 10.0.4.23 which seems strange or is it expected behaviour? (As seen below)

SIP INVITE Request: -

WAN Address >> Kamailio AWS NATed address >> FreeSwitch 1

1X.2X.2X.2X >> 3X.1XX.1XX.2XX

10.0.1.4 >> 10.0.4.23

Many thanks

Regards

Muhammad Zaka