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Administrator’s Guide for CP860 IP conference phones

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NAPTR (Naming Authority Pointer)

First, the IP phone sends the NAPTR query to get the SRV pointer and transport protocol.

Example of NAPTR records:

order pref flags service regexp replacement

IN NAPTR 90 50 "s" "SIP+D2T" "" _sip._tcp.yealink.pbx.com

IN NAPTR 100 50 "s" "SIP+D2U" "" _sip._udp.yealink.pbx.com

Parameters are explained in the following table:

Parameter

Description

order

Specify preferential treatment for the specific record. The order

is from lowest to highest, lower order is MORE preferred.

pref

Specify the preference for processing multiple NAPTR records

with the same order value. Lower value is MORE preferred.

flags

The flag “s” means to perform an SRV lookup.

service

Specify the transport protocols supported by the domain server:

SIP+D2U: SIP over UDP

SIP+D2T: SIP over TCP

SIP+D2S: SIP over SCTP

SIPS+D2T: SIPS over TCP

regexp

Always empty for SIP services.

replacement

Specify a domain name for the next query.

The IP phone picks the first record, because its order of 90 is lower than 100. The pref

parameter is unimportant as there is no other record with order 90. The flag “s”

indicates performing the SRV query next. TCP will be used, targeted to a host

determined by an SRV query of “_sip._tcp.yealink.pbx.com”. If the flag of the NAPTR

record returned is empty, the IP phone will perform the NAPTR query again according to

the previous NAPTR query result.

SRV (Service Location Record)

The IP phone performs a SRV query on the record returned from the NAPTR for the host

name and the port number. Example of SRV records:

Priority Weight Port Target

IN SRV 0 1 5060 server1.yealink.pbx.com

IN SRV 0 2 5060 server2.yealink.pbx.com