I really need help on this as I have weeks into this problem. I thought I had it nailed but I guess not. After 5.5 hours I get: 2010-10-25 15:05:43.407272 [WARNING] sofia_reg.c:387 mguuid Failed Registration, setting retry to 15 seconds. 2010-10-25 15:05:49.557478 [NOTICE] sofia_reg.c:342 Registering mvuuid 2010-10-25 15:05:59.206273 [NOTICE] sofia_reg.c:342 Registering mguuid 2010-10-25 15:06:04.923157 [WARNING] sofia_reg.c:387 mynum777 Failed Registration, setting retry to 30 seconds. 2010-10-25 15:06:05.358321 [WARNING] sofia_reg.c:387 mvuuid Failed Registration, setting retry to 15 seconds. 2010-10-25 15:06:16.125060 [WARNING] sofia_reg.c:387 mguuid Failed Registration, setting retry to 15 seconds. 2010-10-25 15:06:21.151240 [NOTICE] sofia_reg.c:342 Registering mvuuid 2010-10-25 15:06:33.060421 [NOTICE] sofia_reg.c:342 Registering mguuid 2010-10-25 15:06:35.392655 [NOTICE] sofia_reg.c:342 Registering mynum777 and no way to make/get calls until I restart FS. I did this: 1. log 7 2. sofia profile xxxx siptrace on for each profile/gateway 3. restarted router All three did not solve the problem. The trace and log produced no additional lines which is why I am wondering if FS has a problem since the trace shows no SIP activity. 3 gateways with 2 ITSPs 2 DSL/WAN lines, 1 static and 1 dynamic I am using autonat:1.2.3.4 in internal and external profiles. 1.2.3.4 is the external static ip. sofia status profile ... has the right ext ip nat_map status shows the dynamic (wrong) IP I tried starting with -nonat but that was worse the only way to fix is restart FS. I read the wiki on external nat, auto_nat and everything else many times. Thanks Mario