Oracle® Communications EAGLE Database Administration - SS7 User's Guide Release 46.6 E93318 Revision 1 |
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Receiving TFR Messages
If ITU TFR procedures have been enabled for the linkset and a TFR message is received on that linkset, the EAGLE marks the route to the destination as restricted and performs controlled rerouting of the messages that are destined for the destination specified in the TFR message.
If ITU TFR procedures have not been enabled for the linkset and a TFR message is received on that linkset, the TFR message is converted to a TFA (transfer allowed) message and traffic is routed to the destination specified in the TFR message. When this condition is present and a TFR is received on this linkset, UIM 1233 is displayed showing that a TFR was received on a linkset that does not support the TFR procedure.
When a TFR message is received for a route that is already prohibited, and no alternative route exists, the traffic to the concerned node is restarted toward the signaling point from which the TFR message was received.
Invalid TFR messages
The TFR message is ignored under any of these conditions:
Sending TFR Messages
The EAGLE must send a TFR message containing the affected point code (restricted destination) to all accessible adjacent nodes, whose linkset has the TFR procedure enabled, when the following conditions are in effect:
Unlike the ANSI network, the ITU national network does not use response method TFR messages. The ITU national network only uses broadcast method TFR messages that are sent to all adjacent nodes under the conditions described above.
Note:
In ANSI networks, response method TFRs are sent to adjacent nodes in response to a MSU, when that node continues to send MSUs after a broadcast method TFR has already been sent.The EAGLE maintains the status (allowed, restricted, or prohibited) for all destinations. XREF shows the type of message sent when a destination transitions from one status to another.
Table 3-7 Route Management Messages Sent on Status Transition
Status Transition | ITUTFR Procedures Enabled | ITUTFR Procedures Disabled |
---|---|---|
Prohibited to Restricted |
TFR |
TFA |
Allowed to Restricted |
TFR |
None |
Restricted to Prohibited |
TFP |
TFP |
Restricted to Allowed |
TFA |
None |