PJSIP Custom Registration Header
Just quoting the OP as he found the solution, but forgot to add it as an answer:
Edit: I found the solution thanks to a co-worker:
struct pjsip_generic_string_hdr CustomHeader;pj_str_t name = pj_str("MyHeader");pj_str_t value = pj_str("HeaderValue");pjsip_generic_string_hdr_init2(&CustomHeader, &name, &value);pj_list_push_back(&cfg.reg_hdr_list, &CustomHeader);This seems to work as expected.