pbx.jpj.net has no CNAME records.
Question and response
Question
dig pbx.jpj.net. NS
Answer
The response has no answer records.
Authority
jpj.net. 1669 SOA blues.jpj.net. root.blues.jpj.net. 97082768 3600 300 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0