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FXO to FXS Back-to-Back Lab

Hi everyone ,

i have the below config in my home lab and its working just fine ... my confusion comes from that FXO is a two stage calling and i have to configure the plar opx to overcome this issue .... but this lab prove the opposite .. i'm able to do successfully calls from both sides without configuring the plar.

i appreciate any one to shed some light on this ..

FSX-FXO back-to-back.png


R1 Config

dial-peer voice 1001 pots
destination pattern 1001
port 3/0/0
!
!
dial-peer voice 1 pots
destination-pattern 2...
no digit-strip
port 3/0/1

----------------------------------------

R2 Config

dial-peer voice 2001 pots
destination-pattern 2001
port 2/0/0
!
!
dial-peer voice 1 pot
destination-pattern 1...
no digit-strip
port 2/1/0

thanks a lot.

  • IP Telephony
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