Voicemail and PJSIP only: Function SIP_HEADER not registered

[AndreL]

Using only PJsip driver, if a call is ending to the voicemail, the following errors are logged (x12):

ERROR[21213][C-000000db]: pbx_functions.c:610 ast_func_read: Function SIP_HEADER not registered

Is this a config issue ?

[lgaetz (Lorne Gaetz)]

Why I get "res_pjsip_header_funcs.c: This function requires a PJSIP channel"?

Are you having issues? These are harmless and you can ignore them. There are places where FreePBX call flows examine SIP headers Since there are separate dialplan functions for each channel driver, both are run and one will throw the warning that you see.