Time to Service (TTS) features work only if corresponding changes are made to the Avaya H.323-based IP endpoints. The TTS algorithms are implemented in the IP endpoints. These TTS-enabled endpoints continue to support previous link recovery algorithms when communicating with a server that does not support TTS or does not have TTS enabled.

The TTS features works seamlessly with older IP endpoints. However, the benefits of the features are limited to the number of TTS-capable endpoints that support TTS deployed with Communication Manager.