@riccardv commented on this pull request.

In src/modules/ims_ipsec_pcscf/cmd.c:

> -        // for Reply and TCP sends from P-CSCF server port, for Reply and UDP sends from P-CSCF client port
-        src_port = dst_proto == PROTO_TCP ? s->port_ps : s->port_pc;
+        // Check send socket
+        struct socket_info * client_sock = grep_sock_info(via_host.af == AF_INET ? &ipsec_listen_addr : &ipsec_listen_addr6, src_port, dst_proto);
+        if(client_sock) {
+            // for Reply and TCP sends from P-CSCF server port, for Reply and UDP sends from P-CSCF client port
+            src_port = dst_proto == PROTO_TCP ? s->port_ps : s->port_pc;
 
-        // for Reply and TCP sends to UE client port, for Reply and UDP sends to UE server port
-        dst_port = dst_proto == PROTO_TCP ? s->port_uc : s->port_us;
+            // for Reply and TCP sends to UE client port, for Reply and UDP sends to UE server port
+            dst_port = dst_proto == PROTO_TCP ? s->port_uc : s->port_us;
+        }
+        else
+        {
+            src_port = s->port_pc;
+            dst_port = s->port_us;
+        }

Hi @alexyosifov ,

without the patch the ports in case of TCP are always:
src_port = s->port_ps
dst_port = s->port_uc
That are the ones used in case the user agent open the connection.

A pre check is necessary because if this socket is not already open, the use the ports:
src_port = s->port_pc;
dst_port = s->port_us;
that are the port from Proxy Client (pc) -> User Server (us).
Is a attempt to fallback to the other opened socket.

This case can be happens when INVITE transaction is very long due to long Ringing time phase.

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