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State
Data link layer state:
• TEI_UNASSIGNED—No TEI is assigned to the data link
connection.
• ASSIGN_AWAITING_TEI—The data link layer is waiting for TEI
assignment.
• ESTABLISH_AWAITING_TEI—The data link layer is waiting for
TEI assignment and multiple-frame establishment.
• TEI_ASSIGNED—A TEI has been assigned to the data link
connection.
• AWAITING_ESTABLISHMENT—The data link layer is waiting for
multiple-frame establishment.
• MULTIPLE_FRAME_ESTABLISHED—The multiple-frame
operation is successful. The Send Sequence Number and the
Receive Sequence Number for Q.921 frames are synchronized.
• TIMER_RECOVER—On timer expiration, the data link layer is
attempting to recover the link.
• AWAITING_RELEASE—The data link layer is waiting for the
multiple-frame operation to be released.
• TEI_ASSIGNED_EXT1—The data link layer receives a
deactivation instruction from the physical layer when the data link
connection is present.
• TEI_ASSIGNED_EXT2—The data link layer receives a
multiple-frame operation request for a new call.
Network Layer: 1 connections A Q.931 network layer connection is present on the interface.
CallID Index of the call at the CC layer.
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