Running compiled Kamailio 5.8.1 (previously 5.8.0) on Debian 12 64-bit

We're seeing an issue with UDP endpoints (this issue does not happen with TCP and TLS) where usrloc will not send OPTIONS packet keepalives.

Here are all of our usrloc parameters:

modparam("usrloc", "db_mode", 0) modparam("usrloc", "ka_domain", "SIPDOMAIN") #-- SIPDOMAIN is a fqdn modparam("usrloc", "ka_from", "sip:proxy-ping@SIPDOMAIN") modparam("usrloc", "ka_mode", 1) modparam("usrloc", "timer_interval", 20) #-- How often to qualify endpoints and clean mem tables? modparam("usrloc", "timer_procs", 4) modparam("usrloc", "ka_randomize", 10) modparam("usrloc", "use_domain", 0) modparam("usrloc", "server_id_filter", 1) modparam("usrloc", "ka_filter", 0) modparam("usrloc", "ka_timeout", 60) #-- How quickly to expire a contact if it does not reply to keepalive? modparam("usrloc", "matching_mode", 0) modparam("usrloc", "handle_lost_tcp", 1) modparam("usrloc", "close_expired_tcp", 1) modparam("usrloc", "desc_time_order", 1) modparam("usrloc", "hash_size", 14)

It seems usrloc is not actually using timer_interval at all for UDP devices. However, it does seem to be sending OPTIONS every 20 seconds on TCP/TLS. (this is confirmed via packet capture on a SIP phone).