To ensure successful connection of anonymous or private calls, your SIP headers must include the following:
P-Asserted-Identity: This should contain the actual caller’s number.
Privacy: This should be set to id.
Example:
json
P-Asserted-Identity: <sip:0456789876@yousipdomain.com>
Privacy: idThese settings are now mandatory system-wide, in accordance with regulatory guidelines for anonymous calling.