Method for dispatching automatic request callback request by consultation, network element and terminals

The invention provides a method for dispatching an automatic request callback request in a packet network by consultation, a network element and terminals. The method comprises the following steps: a first terminal sends a callback request with callback time limit to the network element after receiving information indicating that a second terminal is non-idle; the network element evaluates an upper limit threshold value and a lower limit threshold value indicating the callback time limit of the second terminal after receiving the callback request; the network element judges whether the callback time limit exceeds the upper limit threshold value and the lower limit threshold value; if the callback time limit is between the upper limit threshold value and the lower limit threshold value, thenetwork element sends information indicating accepting the callback request and arranges the information in a callback waiting queue of the second terminal maintained by the network element accordingto the callback time limi