Section: 5.4.4.2.5 Completion of clearing
Content: A call control entity of the mobile station in any call control state shall, upon receipt of a RELEASE COMPLETE message from its peer entity in the network: stop all running call control timers; release the MM connection; and return to the "null" state. 5.4.4.2.5.1 Abnormal cases The call control entity of the mobile station in the "release request" state shall at first expiry of timer T308 retransmit the RELEASE message and restart timer T308. At second expiry of timer T308, the call control entity of the mobile station shall: release the MM connection; and return to the "null" state. The retransmitted RELEASE message need not contain the Facility IE including an Invoke=CCBSRequest, even if the original RELEASE message did contain this IE.5.4.5 Clear collision Clear collision occurs when both the mobile station and the network simultaneously transfer DISCONNECT messages specifying the same call. The behaviour of the network call control entity receiving a DISCONNECT message whilst in the "disconnect indication" state is specified in subclause 5.4.3. The behaviour of the MS call control entity receiving a DISCONNECT message whilst in the "disconnect request" state is defined in subclause 5.4.4. Clear collision can also occur when both sides simultaneously transfer RELEASE messages related to the same call. The entity receiving such a RELEASE message whilst within the "release request" state shall: stop timer T308; release the MM connection; and enter the "null" state (without sending a RELEASE COMPLETE message).