There is no support for doing such a thing inside of Asterisk itself. The only way would be to not use the Asterisk part and use the PJSIP_HEADER Dialplan function to just add a generic header. That being said, I’m greatly surprised they want that because it’s probably… wrong… of them to want that. “sip:48123456789” would mean a SIP address with a hostname of “48123456789”.
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