params->custom_headers=sal_custom_header_append(params->custom_headers,header_name,header_value);
}
-const char *linphone_call_params_get_custom_header(LinphoneCallParams *params, const char *header_name){
+const char *linphone_call_params_get_custom_header(const LinphoneCallParams *params, const char *header_name){
return sal_custom_header_find(params->custom_headers,header_name);
}