| 摘要 |
<p>A method of controlling a connection between a user terminal and an access node connected to a communication network is provided. The user terminal establishes a data connection with the access node, periodically generates a message at predetermined intervals and transmits the periodic message to at least one network node via the access node over the communication network. Responses to the periodic messages are received from the at least one network node. The responses are analysed to determine whether to terminate the connection to the access node, and in the case that the connection to the access node should be terminated, a disconnect message is transmitted to the access node from the user terminal. Analysing the response could indicate a command to terminate the connection or involve determining that a response has not been received within a predetermined time interval. The periodic messages may be tick messages. The connection may be terminated in response to the at least one network node determining that a user of the user terminal has less than a predetermined quantity of credit. The user terminal may be executing communication client, such as a voice over internet protocol (VoIP) client.</p> |
