Adaptation Rule is a list of one or more variables and ordered actions applied to the message that fulfils one condition. Each condition is associated with one or more actions and zero or more variables. The condition construct identifies the message, and the variable construct stores the information from the message.

Based on the direction of the message, adaptation rules are divided into two categories:

Upon receiving the message, Session Manager applies ingress or egress adaptation rule in the administered order based on the direction. The adaptation rule checks whether the message meets the defined condition. If the message meets the defined condition, the administered variable populates the variable and administered actions in the administered order to adapt the message.