Hello, maybe you can verify e.g. with a log statement if its really send two INVITEs or maybe its just an artefact from the NAT setup with the tracing. It can happen sometimes. Cheers, Henning From: Adil Mafzool Zaka <adil_mafzool(a)yahoo.com> Sent: Dienstag, 14. März 2023 18:07 To: sr-users(a)lists.kamailio.org Subject: [SR-Users] Advertise NAT IP address causing Multiple SIP INVITEs is that expected ? Hi 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 10.0.1.4 •• 10.0.4.23 Many thanks Regards Muhammad Zaka