Ok, I tested and it is working but I would kindly need an explanation

1- the setup : 
- kamailio 5.1 with three listen (on port 5060, 5063, 5066)
- 2 UAs using UDP on port 5063
- added a log in the script


```
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);

```

2- parameter for rr module

```
modparam("rr", "enable_full_lr", 0)
modparam("rr", "enable_double_rr", 1)

```

3- result - on K master, ACK gets forwarded  **properly** using source port 
5036 with the following traces

```
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>`
```


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