There is provided mechanisms for granting network resources for maintaining a communication session for a subscriber in a network. A method is performed by a CTF node. The method includes obtaining, from a gateway in the network, a request for network resources for maintaining the communication session for the subscriber, and requesting, from an OCF node and in response thereto, credit units corresponding to the network resources. The method includes obtaining a grant of the credit units as well as an advance credit indication of additional credit units for the communication session from the OCF node. The method further includes storing the advance credit indication for the communication session and providing, to the gateway, a grant for the network resources for maintaining the communication session in accordance with the obtained grant.