Well i don't want to be nit picking however, i believe you're mistaken here.  You can reuse port on which you are listening for outgoing connections too.
You need to use setsockopt(... SO_REUSEPORT )...  
here goes the demo: 

#!/usr/bin/python3
import socket
import threading


READER1_ADDR = ("127.0.0.1", 23008)
READER2_ADDR = ("127.0.0.1", 23009)



class wait_conn(threading.Thread):
    def __init__(self, addr, name):

        super(wait_conn,self).__init__()

        self.name = name
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
        self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
        self.sock.bind(addr)
        self.sock.listen(3)

    def run(self):
        s, a = self.sock.accept()
        print(self.name, ": Incomming connection from: ",  s.getpeername())
        s.close()
        self.sock.close()


t1 = wait_conn(READER1_ADDR, "r1")
t1.start()
t2 = wait_conn(READER2_ADDR, "r2")
t2.start()

w1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
w1.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
w1.bind(READER1_ADDR)
w1.connect(READER2_ADDR)
w1.close()




t1.join(1.0)
t2.join(1.0)




2018-06-21 21:27 GMT+02:00 Daniel-Constantin Mierla <notifications@github.com>:

Obviously the difference is that kamailio does bind() and listen() on the socket (ip:port) first -- maybe that should have said to be clear about what case we talk here. So try with socket(), bind(), listen() and then connect().

Once there is listen() on a socket, read events for it mean accept() should be done. The kernel won't create an outgoing connection from a listen socket, but use ephemeral ports.

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