support polarity reversal function, meanwhile, you must configure relevance parameters
of polarity reversal in trunk configuration for the IP PBX.
5.3 Register Status
Check SIP/ IAX2 User, and SIP/IAX2 Trunk status. Click【Register Status】to display the
diagram as below:
5.4 System Info
Check OS version, firmware version and memory, etc from here.
Click【System Info】to display the diagram as below:
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