Hello, does anybody have any experience with CNAME resource records in e164 zones. Example: e164.arpa zone 3.3.0.3.7.2.7.2.2.5.3.e164.arpa. IN CNAME 3.3.0.3.7.2.7.2.2.5.3.e164.lu. e164.lu zone 3.3.0.3.7.2.7.2.2.5.3.e164.lu. IN NAPTR 100 10 "u" "E2U+SIP" "!^\\+35227273033(.*)$!sip:0035227273033@voip1.gateway.lu!" .