I am trying to diagnose a gateway down issue,

2016-11-02 17:59:41.304402 [ERR] mod_sofia.c:4391 Gateway 'vgaccount' is down!

(Yes it’s a little old version but need to figure out the root cause)

I have the gigantic sip trace and the log files but not able to figure out why I am seeing this message. Though at the same time I am able to ping the  gateway fine from the same machine. What sort of symptoms should I look for in the log files? I am already looking into network connectivity and other system log files but nothing as of now.

Thanks.