FreeSWITCH is a new telephony engine for me, so I’m just learning it when I have free time.
Today I discovered a 'system' command in FS CLI and for the sake of curiosity typed 'system ping 8.8.8.8'. Nothing changed in the CLI.
Some time later I started to learn how to reload the SIP stack of FreeSWITCH ('reload mod_sofia'). And each time I saw an error:
...
2014-01-04 09:02:57.468709 [ERR] sofia.c:1501 Error Creating SIP UA for profile: internal
2014-01-04 09:02:57.468709 [ERR] sofia.c:1501 Error Creating SIP UA for profile: internal-ipv6
2014-01-04 09:02:57.468709 [ERR] sofia.c:1501 Error Creating SIP UA for profile: external
...
All of SIP-profiles failed when restarting them.
I started searching – who is listening on port 5060. That’s what I’ve discovered:
root@server:/opt/freeswitch/bin# netstat -tulpan | grep 5060
tcp 0 0 10.15.9.10:5060 0.0.0.0:* LISTEN 6887/ping
udp 124576 0 10.15.9.10:5060 0.0.0.0:* 6887/ping
My ping, that 'system' application. I killed it and restarted FreeSWITCH. After that everything works fine.