Beginner question ahead... be gentle. ;-) I compiled FreeSwitch (except module mod_event_socket, see question #1), tried to connect to my SIP service provided by my ISP (xs4all). What I put in in freeswitch.xml: <configuration name="sofia.conf" description="sofia Endpoint"> <profiles> <profile name="XS4ALL"> <registrations> <registration name="xs4all"> <param name="register-scheme" value="Digest"/> <param name="register-realm" value=""/> <param name="register-username" value="08787....."/> <param name="register-password" value="....."/> <param name="register-from" value="sip:100@what_to_put_here?"/> [***note***: what should I put here?] <param name="register-to" value="sip:08787......@sip.xs4all.nl "/> <param name="register-proxy" value="sip:sip.xs4all.nl:5060"/> <param name="register-frequency" value="20"/> </registration> </registrations> .... So: what should I use for register-from? It does not seem to work this way, in the log file I see "received garbage" The log file shows: freeswitch@macserver.local> 2006-10-29 23:16:54 [NOTICE] switch_loadable_module.c:147 switch_loadable_module_process() Adding Timer 'soft' outbound(0x689090): detected NAT: my.ip.number != my.ip.number [***note***: my.ip.number shows my public IP address] 2006-10-29 23:16:54 [DEBUG] mod_sofia.c:4000 event_callback() event [nua_i_outbound] status [101][NAT detected] session: n/a 2006-10-29 23:16:54 [DEBUG] mod_sofia.c:4148 event_callback() nua_i_outbound: unknown event 8: 101 NAT detected 2006-10-29 23:16:54 [DEBUG] mod_sofia.c:4000 event_callback() event [nua_r_register] status [501][Third party not supported] session: n/a nta_agent: received garbage from udp/82.101.62.99:5060/sip [***note***: 82.101.62.99 = sip.xs4all.nl] nta_agent: received garbage from udp/82.101.62.99:5060/sip nta_agent: received garbage from udp/82.101.62.99:5060/sip nta_agent: received garbage from udp/82.101.62.99:5060/sip nta_agent: received garbage from udp/82.101.62.99:5060/sip 2006-10-29 23:17:05 [NOTICE] mod_sofia.c:4187 check_oreg() registering xs4all