4.2.1 NAPTR Record

NAPTR stands for Name Authority Pointer. NAPTR records are most commonly used for applications in Internet telephony.

A NAPTR record contains the following information:

• Type
• Order
• Preference
• Flags
• Service
• Regex
• Replacement

The following table lists example values for each field.

Table 4-4 NAPTR Record

Field	Example
domainName	9.0.0.9.9.8.4.7.3.3.e164.arpa.
TTL	86400
type	SRV
order	100
preference	10
flags	"p"
service	"E2U+PSTN:SIP"
regex	"!^.*$!tel:[phone]\;npdi\;rn=[phone]!"
replacement	.

NAPTR records are formatted as follows:

domainName TTL type order preference flags service regex replacement

Formatting the sample record accordingly:

9.0.0.9.9.8.4.7.3.3.e164.arpa. 604800 NAPTR 100 10 "p" "E2U+PSTN:SIP" "!^.*$!tel:[phone]\;npdi\;rn=[phone]!" .