<p>Ok, I tested and it is working but I would kindly need an explanation</p>
<p>1- the setup :</p>
<ul>
<li>kamailio 5.1 with three listen (on port 5060, 5063, 5066)</li>
<li>2 UAs using UDP on port 5063</li>
<li>added a log in the script</li>
</ul>
<pre><code>route[WITHINDLG] {
if (!has_totag()) return;
# sequential request withing a dialog should
# take the path determined by record-routing
if (loose_route()) {
route(DLGURI);
if (is_method("BYE")) {
setflag(FLT_ACC); # do accounting ...
setflag(FLT_ACCFAILED); # ... even if the transaction fails
} else if ( is_method("ACK") ) {
# ACK is forwarded statelessly
xlog("forced socket $fs\n");
route(NATMANAGE);
} else if ( is_method("NOTIFY") ) {
# Add Record-Route for in-dialog NOTIFY as per RFC 6665.
record_route();
}
route(RELAY);
</code></pre>
<p>2- parameter for rr module</p>
<pre><code>modparam("rr", "enable_full_lr", 0)
modparam("rr", "enable_double_rr", 1)
</code></pre>
<p>3- result - on K master, ACK gets forwarded <strong>properly</strong> using source port 5036 with the following traces</p>
<pre><code>Feb 14 17:13:50 mcudev3 /usr/local/sbin/kamailio[21394]: {1 5765 ACK ffb8d7ca-efae-79ef-6035-dd1043352c55} DEBUG: rr [loose.c:812]: after_loose(): Topmost route URI: 'sip:172.21.100.108:5063;lr' is me
Feb 14 17:13:50 mcudev3 /usr/local/sbin/kamailio[21394]: {1 5765 ACK ffb8d7ca-efae-79ef-6035-dd1043352c55} DEBUG: <core> [core/parser/msg_parser.c:89]: get_hdr_field(): found end of header
Feb 14 17:13:50 mcudev3 /usr/local/sbin/kamailio[21394]: {1 5765 ACK ffb8d7ca-efae-79ef-6035-dd1043352c55} DEBUG: rr [loose.c:181]: find_next_route(): No next Route HF found
Feb 14 17:13:50 mcudev3 /usr/local/sbin/kamailio[21394]: {1 5765 ACK ffb8d7ca-efae-79ef-6035-dd1043352c55} DEBUG: rr [loose.c:842]: after_loose(): No next URI found
Feb 14 17:13:50 mcudev3 /usr/local/sbin/kamailio[21394]: {1 5765 ACK ffb8d7ca-efae-79ef-6035-dd1043352c55} ERROR: <script>: forced socket <null>`
</code></pre>
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