I am currently running FreeSwitch very successfully, thanks to the help from many on this list. I am new to Linux so it was a challenge. FS runs on a small LAN with about 5 other computers. The connection to the internet is DSL with 3M down and 768kb down via Covad. The ITSP is Flowroute. If one of the computers does a big download, it messes with FS in two ways. If a connection is made, the voices are broken up, intermittent and difficult to understand. If the download is long enough, the connection to Flowroute is no longer usable due to registration failure. Somehow I need to isolate the FS box from the rest of the LAN, or give its traffic precedence. Covad's suggestion was to place the FS box in the DMZ. If I have to, I'll get another DSL line and isolate it that way. Is there a write-up anywhere that might help me with this problem, or lacking that, can anyone offer advice? 581 2009-10-26 07:15:58.307011 [NOTICE] sofia_reg.c:333 Registering flowroute 582 2009-10-26 07:15:59.275622 [DEBUG] sofia.c:707 nua_i_outbound: unknown event 8: 101 NAT detected 583 2009-10-26 07:15:59.470887 [DEBUG] sofia_reg.c:1414 Changing expire time to 2243 by request of proxy sip:sip.flowroute.com ... 1087 2009-10-26 07:16:00.623158 [DEBUG] mod_event_socket.c:2302 Socket up listening on 127.0.0.1:8021 1088 2009-10-26 07:16:01.382171 [DEBUG] sofia.c:707 nua_i_outbound: unknown event 8: 101 NAT detected 1090 2009-10-26 07:26:34.918724 [DEBUG] sofia_reg.c:1414 Changing expire time to 1607 by request of proxy sip:sip.flowroute.c 1091 2009-10-26 07:44:56.715662 [DEBUG] sofia_reg.c:1414 Changing expire time to 505 by request of proxy sip:sip.flowroute.co 1092 2009-10-26 07:49:52.278202 [DEBUG] sofia_reg.c:1414 Changing expire time to 210 by request of proxy sip:sip.flowroute.co 1093 2009-10-26 07:52:30.468045 [DEBUG] sofia_reg.c:1414 Changing expire time to 52 by request of proxy sip:sip.flowroute.com 1094 2009-10-26 07:52:49.234006 [DEBUG] sofia_reg.c:1414 Changing expire time to 33 by request of proxy sip:sip.flowroute.com 1095 2009-10-26 07:53:00.605161 [DEBUG] sofia_reg.c:1414 Changing expire time to 22 by request of proxy sip:sip.flowroute.com 1096 2009-10-26 07:53:12.379214 [DEBUG] sofia_reg.c:1414 Changing expire time to 10 by request of proxy sip:sip.flowroute.com 1097 2009-10-26 07:53:19.627029 [DEBUG] sofia_reg.c:1414 Changing expire time to 3 by request of proxy sip:sip.flowroute.com 1098 2009-10-26 07:53:20.106923 [NOTICE] sofia_reg.c:333 Registering flowroute 1099 2009-10-26 07:53:20.454870 [DEBUG] sofia_reg.c:1414 Changing expire time to 2 by request of proxy sip:sip.flowroute.com 1100 2009-10-26 07:53:20.705833 [NOTICE] sofia_reg.c:333 Registering flowroute 1101 2009-10-26 07:53:20.952781 [DEBUG] sofia_reg.c:1414 Changing expire time to 1 by request of proxy sip:sip.flowroute.com 1102 2009-10-26 07:53:21.205740 [NOTICE] sofia_reg.c:333 Registering flowroute 1103 2009-10-26 07:53:21.705656 [NOTICE] sofia_reg.c:333 Registering flowroute 1104 2009-10-26 07:53:22.002609 [DEBUG] sofia_reg.c:1414 Changing expire time to 60 by request of proxy sip:sip.flowroute.com 1105 2009-10-26 09:06:17.554726 [ERR] sofia_reg.c:1425 flowroute Registration Failed with status Operation has no matching challenge [904]. failure #1 Thanks Lars