I live in India. I have a VoIP Service account from the state telecom provider (BSNL Wings). I am trying to use it with FreePBX installed on my Linux PC. I have configured the PJSIP trunk on FreePBX. the trunk shows as registered.
But I am not able to make Outgoing calls or receive incoming calls.
this error is indicated in the outgoing call log:
[2021-06-08 13:58:19] ERROR res_pjsip_header_funcs.c: No headers had been previously added to this session.
Also, when I try to call the number from my mobile phone, I am unable to make the call.
When I configured this same VoIP account directly on my IP phone , on the same local network, it works fine.