After updating to 16.6.2-1; Outbound faxes from ATAs that are using PJSIP are failing to almost all destinations. Tried several different ATAs and Fax machines; downgrading to 16.4.1 fixes the outbound faxes. Outbound faxes from the fax server itself works fine on 16.6.2.
Note: As soon as downgrading to 16.4.1 is complete and the service restarted outbound faxes works fine.
Tested this several times. It failed 40 out of 40 test attempts to the HP Test Fax Number: 8884732963
ATA: Cisco ATA122
Has anyone else experienced this and do you have a workaround to make this work again with the latest build of Asterisk?