first day lessons with a HT 503 connected to a POTS PSTN (FXO port) and a non-VoIP phone (FXS port) [plus Asterisk server on WAN as SIP server, FXS and FXO each have their own SIP UserID]:

• a. firmware updated using the Grandstream TFTP server to 1.0.0.15
• b. _all_ configuration defaults

result:

• a. *00 dialed at the FXS port would flash the LINE for a very brief instant and instead of PSTN dial tone would get a busy signal.
• b. dialing the FXO port from the WAN would behave the same as above.

two configuration changes are needed so the FXO port no longer behaves like it is broken in some way:a. FXO PORT

• Dial Plan: {[x*]+} (Default is {x+})

b. FXO PORT -> FXO Termination

• Enable Current Disconnect: No (Default is Yes)

 the * key must be permissible for the *00 feature to work! POTS does not use current disconnect. ----- Hope this helps! 

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