The 3CX Phone System seems to have no SIP link monitoring. Does anyone know if the is right ? When a SIP phone lost his network connection during a call and so the BYE diagram gets lost, the call stays (forever ?) active. At least for some hours I have seen. If the user do not uses a phone client (Windows Client, Webclient) the user will not get noticed about that and does not get any incoming calls anymore and he also cannot terminate this “gost call”. I think this is an issue. If I be informed correctly other SIP systems uses the SIP OPTIONS diagram to get the current status of an endpoint and it seems that is missing in 3CX. Any opinions ?