Step 2
Lookup NAPTR RR’s in DNS, and apply NAPTR/ENUM algorithm
4.3.2.1.7.9.8.6.4.e164.arpa.
!^.*$!mailto:spam@paf.se!!^+46(.*)$!ldap://ldap.telco.se/cn=0\1!
Use rewrite rules using regular expressions which operate on the E.164 number (+468971234)
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