How to write a custom context?

Question

Asterisk

Hello!
bitrix24 is connected via pjsip ext, in the call it sends X-Extension-Number - the number of the caller.
How can I pull it out and replace the caller's number with it?

Answer 1

"The question is not of real difficulty."
How to rewrite the context in FreePBX
https://asterisk-pbx.ru/wiki/freepbx/custom_context
How to get a variable from the SIP header
https://wiki.asterisk.org/wiki/display/AST/Asteris...