PJSIP and Vitelity

I’m so confused about how to use PJSIP with Vitelity. It seems Vitelity only uses port 5060. So I set PJSIP Trunk (inbound) to use it. So basically I only enter the IP of their server GUI. But all day long these error message are appearing:

[2016-01-26 11:18:04] ERROR[13205] res_pjsip.c: Unable to create outbound OPTIONS request to endpoint as URI ‘sip:@’ is not valid

[2016-01-26 11:18:04] ERROR[13205] res_pjsip/pjsip_options.c: Unable to create request to qualify contact sip:@

However calls are working properly, just trying to get ride of there error messages
Using system is PIAF Incredible 13.12-2