Method, apparatuses and computer-readable media relating to event subscription in a communication network

A method performed by a subscribing network entity for subscribing to event notifications from a common application programming interface framework, CAPIF, core function in a telecommunications network, the method comprising:

• sending an event subscription request message to the CAPIF core function, the event subscription request message comprising an indication of an event filter, the event filter to be utilized by the CAPIF core function for filtering event notifications to be sent to the subscribing network entity, the event filter comprising:
• an identity of one or more network entities associated with events to be notified to the subscribing network entity;
• and an indication of a type of event to be notified to the subscribing network entity.