| 摘要 |
An active call between two parties can be established as a call having priority over other users in a tiered priority system. Changes to the level of priority are permitted if made by an authorized user in attendance on the active call. The change of call priority can be to either raise or lower the priority based on call circumstances. If approved, the new active call priority level is propagated to other nodes and switches so that system knowledge of the new priority level is consistent. The new priority level is reset to the pre-established call priority level after the active call is completed.
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