: It is frequently used with the Kamailio or OpenSIPS SIP servers to handle "Presence" and "Resource List Server" (RLS) features. Main Capabilities

To use XCap 1.2.1 in a production or development stack, it is usually paired with the following components: : Examples include OpenXCAP from AG Projects.

: Like Kamailio or OpenSIPS , which utilizes the library to authorize SIP requests based on the XML rules. XCAP Module - openSIPS

: Facilitates setting authorization rules that determine who can see a user’s online status.

: It provides an interface for managing user data such as presence authorization rules, resource lists (contact lists), and service configurations.

: 1.2.1 was a significant maintenance release that fixed issues found in the 1.2.0 version.