SS7 - MTP3 (Message Transfer Part 3)

MTP3 does message handling and network management.

Message handling


Signaling Link Management
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Signaling link activation,deactivation
SLTM - Signaling Link Test Message
SLTA - Signaling Link Test Acknowledge


Traffic Management
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Changeover (COO and COA)
COO - Change Over Order
COA - Change Over Acknowledgment
Changeback (CBD and CBA)
CBD - Change Back Declaration
CBA - Change Back Acknowledgment
Management inhibiting/Uninhibiting
MTP restart
Signaling traffic control
Forced rerouting
Controlled rerouting




Route Management
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TFP (Transfer Prohibited)
FTR (Transfer Restricted)
TFC (Transfer Controlled)
TFA (Transfer Allowed)
SRSM (Signaling-route-set-test)




Clusters
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MTP3 Timers -
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Timer T17 : Timer T17 (MTP3) prevents the rapid oscillation from in service to out of service. Timer T17 is started when the link begins the alignment procedure. No further alignment attempts are accepted from a remote or local SP until T17 has expired.