When I make REGISTER request to server Kamailio. Kamailio sometimes return me REGISTER 200 OK response with many Contacts in Contact header field
Contact: sip:user1@1.1.1.1:58492 ;transport=TLS;ob;expires=29;received="sip:1.1.1.1:58492;transport=TLS", sip:user1@3.3.3.3:58520;transport=TLS;ob;expires=244, sip:user1@1.1.1.1:58529 ;transport=TLS;ob;expires=284;received="sip:1.1.1.1:58529;transport=TLS", sip:user1@3.3.3.3:58548;transport=TLS;ob;expires=329, sip:user1@3.3.3.3:58562;transport=TLS;ob;expires=393, sip:user1@1.1.1.1:58571 ;transport=TLS;ob;expires=483;received="sip:1.1.1.1:58571;transport=TLS", sip:user1@2.2.2.2:58588;transport=TLS;ob;expires=538, sip:user1@1.1.1.1:58600 ;transport=TLS;ob;expires=587;received="sip:1.1.1.1:58600;transport=TLS", sip:user1@2.2.2.2:58611;transport=TLS;ob;expires=630, sip:user1@1.1.1.1:58624 ;transport=TLS;ob;expires=670;received="sip:1.1.1.1:58624;transport=TLS", sip:user1@2.2.2.2:58632;transport=TLS;ob;expires=706, sip:user1@1.1.1.1:58650 ;transport=TLS;ob;expires=826;received="sip:1.1.1.1:58650;transport=TLS", sip:user1@2.2.2.2:58661 ;transport=TLS;ob;expires=900;+sip.instance="urn:uuid:00000000-0000-0000-0000-00007dtrf0a4c";reg-id=1
Why is that ?