Blocking 180 Ringing With PJSIP How To

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​I have a business need to block any 180 Ringing packets coming from an FXO
gateway, Grandstream 4108. I use Asterisk 13.9.1, and PJSIP. Is this even possible? I all I may do is hack the source code, will it be PJSIP code or Asterisk code? Any help on where to look for the relevant code?​

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