[2016-03-08 10:19:47] WARNING[1531]: pjsip:0 <?>: tsx0x7fb340013 .Error sending Request msg OPTIONS/cseq=599 (tdta0x37f3af0): Network is unreachable
[2016-03-08 10:19:47] WARNING[1531]: pjsip:0 <?>: tsx0x7fb340013 .Transport error, terminating transaction. Err=120101 (Network is unreachable)
[2016-03-08 10:19:48] WARNING[1531]: pjsip:0 <?>: tsx0x7fb33c1d8 .Error sending Request msg OPTIONS/cseq=35494 (tdta0x370fd40): Network is unreachable
[2016-03-08 10:19:48] WARNING[1531]: pjsip:0 <?>: tsx0x7fb33c1d8 .Transport error, terminating transaction. Err=120101 (Network is unreachable)
i kept getting this error this morning. What is this?