$TTL 1h
@ IN SOA ns.e164.arpa. root.e164.arpa. (
                                                        2009010918 ;serial
                                                        3600 ;refresh
                                                        3600 ;retry
                                                        3600 ;expire
                                                        3600 ;minimum TTL
)
@ IN NS e164.arpa.
@ IN A DNS_IP

; Wildcard to match any tel:+xxxx and change to sip:xxxx@IMS_DOMAIN
* IN NAPTR 10 100 "u" "E2U+sip" "!(^.*$)!sip:\\1@IMS_DOMAIN!" .
* IN NAPTR 20 100 "u" "E2U+sip" "!(^.*$)!sip:+\\1@IMS_DOMAIN!" .