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User Binding Request with credentials in Lync Dump

I've dumped a call between two lync clients and saw that there were some UDP packets that look like this:

Server -> Client

1132    14.495362000    <serverip> <clientip>   STUN    146 Binding Request user: ????:????

Client -> Server:

1133    14.499136000    <clientip>  <serverip>  STUN    130 Binding Success Response XOR-MAPPED-ADDRESS: <serverip>:54019 user: ????:????

????:???? - ? is a character from the alphabet

If I read the RFC correctly this is not a security issue, is that correct?