CANCEL
cancel_command: CANCEL
%token CANCEL CLEAR COMMIT CREATE DESTROY END EXIT EXPORT GET HELP
%type <cmd> cancel_command CANCEL
if (token_type != CANCEL &&
case CANCEL:
type = CANCEL;
case CANCEL:
%token HELP CREATE EXPORT ADD DELETE REMOVE SELECT SET INFO CANCEL END VERIFY
%type <cmd> cancel_command CANCEL
cancel_command: CANCEL
| CANCEL TOKEN
case CANCEL:
(method == ACK || method == CANCEL)) {
} else if (sip_msg_info->sip_req_method == CANCEL) {