Hello,

I have read the documentation under https://wiki.freeswitch.org/wiki/Sofia-SIP#Adding_Request_Headers and as I understood it is possible to add

Headers to SIP requests simply by changing the configuration.

But the documentation refers to the dialing plan.

I tried to add headers to an outgoing REGISTER but failed.

Because the documentation refers to the dialplan and changing headers for existing calls, I am not sure if adding headers to a REGISTER request is possible or not.

Can anyone please tell me if it is possible or not and if yes, how to formulate the correct “<action application=”set” …>” and “<condition>” sections in the configuration.

Thanks in advance for all answers.

Best Regards,
Lars