Release Procedure

To clear an active call or a call in progress, send a RELEASE message down to Q.93B and wait for a RELEASE_COMPLETE from Q.93B. Any time you receive a RELEASE_COMPLETE message from Q.93B, release the virtual channel if the call is active or in progress.

Q.93B never sends a RELEASE message to the end user; it will always send a RELEASE_COMPLETE. Only send the RELEASE_COMPLETE message when rejecting a call in response to a SETUP message from Q.93B. At any other time, to reject or tear down a call, send a RELEASE message to Q.93B.