On a usrloc record there is an Address field and Received field. The Received field is sometimes not set. What causes it to be not set and what is the difference between the two fields. Sorry if this is a dumb question, I looked at documentation but couldn't find it spelled out. Here is are 2 examples from kamcmd ul.dump:

{
       AoR: utkcf9b6h3@ata.phaxio.com
       Contacts: {
               Contact: {
                       Address: sip:utkc4ff9b6h3@69.78.34.56:4615;transport=tcp
                       Expires: 42
                       Q: -1.000000
                       Call-ID: d1c314305df3d342@192.168.0.3
                       CSeq: 129173
                       User-Agent: OBIHAI/OBi200-3.2.2.5898
                       Received: [not set]
                       Path: [not set]
                       State: CS_NEW
                       Flags: 0
                       CFlags: 0
                       Socket: tcp:10.0.22.254:5060
                       Methods: 7839
                       Ruid: uloc-5fbdd369-491e-4
                       Instance: <urn:uuid:00000000-0000-0000-0000-9cadef62b3da>
                       Reg-Id: 0
                       Server-Id: 0
                       Tcpconn-Id: 58
                       Keepalive: 0
                       Last-Keepalive: 1606317577
                       Last-Modified: 1606317577
               }
       }
}

Contact: {
Address: sip:mfjngfd272av@192.168.0.106:5060
Expires: 30
Q: -1.000000
Call-ID: 67413de375b2e76c@192.168.0.106
CSeq: 146320
User-Agent: OBIHAI/OBi300-3.2.2.5921
Received: sip:70.34.56.78:5060
Path: [not set]
State: CS_NEW
Flags: 0
CFlags: 64
Socket: udp:10.0.22.254:5060
Methods: 7839
Ruid: uloc-5fbdd369-490e-efa3
Instance: <urn:uuid:00000000-0000-0000-0000-9cadef810877>
Reg-Id: 0
Server-Id: 0
Tcpconn-Id: -1
Keepalive: 1
Last-Keepalive: 1606314719
Last-Modified: 1606314719
}