### Description I have enabled `tcp_accept_haproxy=yes`, inbound TCP connection received on IPv6 kamailio socket but client real IP is IPv4. When kamailio add `Record-Route` header then added IPv6 header and not added IPv4. Example ``` INVITE sip:xxxx@example.com SIP/2.0 Record-Route: <sip:9sovfn2oP7ozLQID7BkFxBNt/CfE+wc=@[2600::6]:5060;r2=on;lr=on> Record-Route: <sip:9sovfn2oP7ozLQID7BkFxBNt/CfE+wc=@[2600::6]:5060;transport=tcp;r2=on;lr=on> ``` From client perspective Kamailio make protocol conversion from the IPv4 to IPv6, and expected to see IPv4 in the IPv4 address in the received 'Record-Route' headers to use in the future requests. Because client receiving IPv6 only and client does not have IPv6 address, then `ACK` message cannot be send to Kamailio. ### Expected behavior Kamailio will use Kamailio server load balancer address to generate `Record-Route` headers. Load balancer IP address can be received from the HAPROXY protocol. #### Actual observed behavior Kamailio use listeneer socket IP to generate `Record-Route` headers. -- Reply to this email directly or view it on GitHub: https://github.com/kamailio/kamailio/issues/3666 You are receiving this because you are subscribed to this thread. Message ID: &lt;kamailio/kamailio/issues/3666(a)github.com&gt;