I've set tos=IPTOS_RELIABILITY in my configuration, which follows https://www.kamailio.org/wiki/cookbooks/3.2.x/core#tos which has the following examples: tos=IPTOS_LOWDELAY tos=0x10 tos=IPTOS_RELIABILITY but I get a configuration error: 0(45338) :<core> [cfg.y:3501]: parse error in config file /usr/local/etc/kamailio/kam-global.inc, line 29, column 5-21: syntax error 0(45338) :<core> [cfg.y:3501]: parse error in config file /usr/local/etc/kamailio/kam-global.inc, line 29, column 5-21: number expected Has this option been deprecated or is it a small bug?