[asterisk-users] getting lots of warnings

[Nick Awesome]

what may cause this, and how can I fix it ?
 WARNING[23010]: pjsip:0 <?>: 	tsx0x7f24f41b2 ..Failed to send Request msg NOTIFY/cseq=15293 (tdta0x7f2480001a70)! err=171064 (Unsuitable transport selected (PJSIP_ETPNOTSUITABLE))
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