What does a successful ENUM query return, and what is the format of the tel-uri?

Modified on Fri, 7 Mar at 11:45 AM

A successful query will return a NAPTR Record with a tel-uri in the format tel:+msisdn.

Example:

;; ANSWER SECTION:

0.6.0.0.1.6.6.6.7.0.4.e164.arpa. 864000 IN NAPTR 100 10 "U" "E2U+pstn:tel" "!^(.*)$!country=null\;operator=null\;mcc=604\;mnc=001\;ported=false\;err=0!" .

;; Query time: 3 msec

;; SERVER: DFIP#5353(DFIP)

;; WHEN: Thu May 4 15:04:56 2023

;; MSG SIZE rcvd: 187

The parameters returned are based on RFC4694 (https://tools.ietf.org/html/rfc4694):

tel – the original number queried

npdi – NP Database Dip Indicator (indicates to any downstream systems a portability lookup has been performed)

rn – Routing Number (LRN for USA/Canada)

cic – Carrier Identification Code

cc – Country Code cn – Carrier short name nt – Number type (mobile/fixed) mcc – MCC of the network (if mobile nt) mnc – MNC of the network (if mobile nt)

ported – Whether the number has been ported or not