Netsock2.c: getaddrinfo: Name or service not known

I have created 2 extensions, 101 & 102. 101 is configured on zoiper soft phone & 102 is opened on UCP webphone.
I called from 101 (soft phone) to 102 (web phone), upon receiving it from webphone I get following error:

[2017-11-13 18:47:45] ERROR[17088][C-00000026] netsock2.c: getaddrinfo(“fuhho6u9nhsh.invalid”, “(null)”, …): Name or service not known

What actually does this error mean & how can i resolve this. Though I have no error in my calls, call is clear with out error.
I have seend in other post that fuhho6u9nhsh is not resolved in host file. But this > fuhho6u9nhsh is dynamic.