One way audio: PJSIP over PRI

I’m having a problem using PJSIP, callee hears me but I got absolute silence on my side…
Few pointers:

  1. Chan_SIP works perfectly.
  2. PBX and phones are on the same network (no NAT).
  3. The problem occurs only on outgoing calls over PRI (no problem when using IAX2 trunk).
  4. Asterisk Version - 13.4.0 Freepbx Version - 6.12.65-26 PJSIP version - 2.2 DAHDI version -
    I know PJSIP is experimental but I have been able to use PJSIP over PRI before.

What can be the issue?

Thank You.