What's the function of pbx number-parameter?

If the trunk function is not used, change the dialup timer value of the AT0 trunk to 0. The AR does not need to spend 5s on detecting the ringback tone. A user needs to wait for only 3s to hear the ringback tone.
Run the pbx number-parameter 40 0 command to set parameter 40 to 0.
The modification may cause failures of calls transferred through trunks. The pbx number-parameter 40 0 command can be used only when POTS or SIP phones make outgoing calls through AT0 trunks.

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