The address is the socket kamailio is listening on, which is typically ip:5060.

With tcp the source port of connect() cannot be easily ensured (only with latest kernels when re-using the port option is enabled).

So this is by design, otherwise there will be different ports for each connection.

If you want to change, that's fine, you can make pull request so other can review, however add a modparam to control this behaviour, with the default option to be like it is now.

Thank you Daniel Could you give me reference to code where outbound TCP socket created/bound. I will try debug.

Here is relevant page how to get source port for outbound connection. https://stackoverflow.com/questions/47095534/how-to-get-local-source-port-fr...

How to bind selected port for outbound connection. https://github.com/openssh/openssh-portable/pull/130

Daniel @miconda could you look this links. Think first allow resolve issue. Second link will allow send TCP outbound messages from kamailio `socket` port instead of random port.

Example how get outbound socket port ```c #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h>

#define SERVER_ADDR "172.217.160.99" #define SERVER_PORT 80

int main() { char myIP[16]; unsigned int myPort; struct sockaddr_in server_addr, my_addr; int sockfd;

// Connect to server if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { perror("Can't open stream socket."); exit(-1); }

// Set server_addr bzero(&server_addr, sizeof(server_addr)); server_addr.sin_family = AF_INET; server_addr.sin_addr.s_addr = inet_addr(SERVER_ADDR); server_addr.sin_port = htons(SERVER_PORT);

// Connect to server if (connect(sockfd, (struct sockaddr *) &server_addr, sizeof(server_addr)) < 0) { perror("Connect server error"); close(sockfd); exit(-1); }

// Get my ip address and port bzero(&my_addr, sizeof(my_addr)); socklen_t len = sizeof(my_addr); getsockname(sockfd, (struct sockaddr *) &my_addr, &len); inet_ntop(AF_INET, &my_addr.sin_addr, myIP, sizeof(myIP)); myPort = ntohs(my_addr.sin_port);

printf("Local ip address: %s\n", myIP); printf("Local port : %u\n", myPort);

return 0; } ```

Found at https://gist.github.com/listnukira/4045436