Previous version was 5.3.x (released on October, 2019), see what was new in that release at:

• http://www.kamailio.org/wiki/features/new-in-5.3.x

This is a draft of new features added in this version, manually updated, thus not always synchronized with what is new in source code repository.

Flexible headers management $x_hdr exported variables.

• https://www.kamailio.org/docs/modules/5.4.x/modules/pv_headers.html

Added new cfgt.list and cfgt.clean RPC commands

• https://www.kamailio.org/docs/modules/5.4.x/modules/cfgt.html#cfgt.r.list
• https://www.kamailio.org/docs/modules/5.4.x/modules/cfgt.html#cfgt.r.clean

Added path value to xavp_rcd location record

• https://www.kamailio.org/docs/modules/5.4.x/modules/registrar.html#registrar.p.xavp_rcd

Added xavp_rcd_mask parameter to control what values to skip

• https://www.kamailio.org/docs/modules/5.4.x/modules/registrar.html#registrar.p.xavp_rcd_mask