Daniel, first check and fix sys.exit) -> sys.exit() and sys,exit() -> sys.exit()
Replace sys.exit() with `return` to avoid abruptly stopping the Kamailio process.
try it:
if not ksr.siputils.has_totag(): ksr.info("has to tag") return
if ksr.is_method("ACK"): if ksr.tm.t_check_trans(): ksr.relay() return else: return ksr.sl.send_reply(404, "Not here") return
regards!