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messages can be originated by the STP to learn about the state of the signaling network. Some examples include:
* an STP may send route set test messages to probe the availability of a particular SEP;
* it may send low-level MTP messages to an adjacent signaling point to check the Bit Error Rate (BER) on a particular signaling link; or
* it may let other adjacent signaling points know that it is going out of service; in this way, the adjacent signaling points will try to avoid this

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