XCAPI is compatible with H.323 and SIP, supporting the most important standard systems on the market. As such, XCAPI is interoperable with H.323- and SIP-compatible end devices and gateways from all manufacturers. In addition, manufacturer-specific characteristics of the most important providers are used.

Detailed information on individual telephone systems is available on the Interoperability List, an up-to-date version of which can be downloaded each month.