determines independently if each peer is available based on the success of signalling requests, timeouts, reattempts etc.
At its simplest form a peer can be either alive or dead (reachable or not), in the extended case we introduce an intermediate state of "impaired".
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s use this knowledge to make better choices about routing traffic. For an impaired peer, the traffic offered to deal with overloaded peers (for instance, using SIP 503 error message rates) is reduced. This is applicable to the network side of the ASBC/ UNI cases as well as both sides of the NNI/peering
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cases.
Description
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Figure
1
Availability-Reachability tracking by SBC
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s 1-8 are A-
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s.
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9 & 10 are NNI/Peering
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s.
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s 1-4 are configured to only send requests to AS1
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s 5-8 can offer requests to either AS1 or AS2
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s 1-8 do not offer traffic directly to each other, they only send/receive traffic from an AS
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s 9 & 10 can offer traffic to each other as there maybe transit calls that do not need to go to an AS
Each
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maintains the status of availability of the peers with which it communicates.