Hi,
The documentation for the `enum` module says:
"Finally, enum_query associates a q value with each new URI based on the <order, preference> of the corresponding NAPTR record."
Then just read this whole section of the TM module docs. :-)
https://kamailio.org/docs/modules/5.6.x/modules/tm.html#tm.serial_forking
What you're after is serialising what is by default parallelised. I believe this should help you take control of that process.
-- Alex