Hello I'm a asterisk user, and i would like to try freeswitch for having a real multi tenant system. I configured FS with fusionpbx. My FS is installed on a VPS ( has a public IP ), my extensions are behind a nat router. After few minutes my phone became unreachable for inbound call. After a outbound call, the phone is again reachable for few minutes. I captured the traffic on server side with tcpdump, unlike my asterisk server, freeswitch never send to the phone a keepalive packet ( SIP OPTIONS ) I added theses options in sip_profiles/internal.xml <param name="aggressive-nat-detection" value="true"/> <param name="enable-timer" value="false"/> <param name="NDLB-received-in-nat-reg-contact" value="true"/> <param name="NDLB-force-rport" value="true"/> <param name="NDLB-broken-auth-hash" value="true"/> <param name="sip-force-expires" value="240"/> <param name="all-reg-options-ping" value="true"/> <param name="registration-thread-frequency" value="30"/> <param name="unregister-on-options-fail" value="true"/> <param name="nat-options-ping" value="true"/> Please note the strange expiry delay. After being powered off, the phone stays registered. freeswitch@internal> sofia status profile internal reg Registrations: ================================================================================================= Call-ID: 24ef-c0a80101-5-1@192.168.0.10 User: 7082@mydomain Contact: "" <sip:7082@192.168.0.10:5090;transport=udp;user=phone;fs_nat=yes;fs_path=sip%3A7082%4086.201.x.x%3A5090%3Btransport%3Dudp%3Buser%3Dphone> Agent: THOMSON ST2030 hw5 fw2.76 00-14-7F-00-4C-1A Status: Registered(UDP-NAT)(unknown) EXP(1907-10-11 18:28:34) EXPSECS(909113102) Ping-Status: Reachable Host: vpsxxxxxx.ovh.net IP: 86.201.x.x Port: 5090 Auth-User: 7082 Auth-Realm: mydomain MWI-Account: 7082@mydomain Any idea ? Best regards