AudioCodes Mediant 800 User Manual page 1257

CHAPTER 72 Configuration Parameters Reference
'Proxy DNS Query Type'
configure voip > sip-
definition proxy-and-
registration > proxy-dns-
query
[ProxyDNSQueryType]
Parameter
Mediant 800 Gateway & E-SBC | User's Manual
Description
■ [1] SRV = If the Proxy/Registrar IP address
parameter, Contact/Record-Route headers, or IP
address configured in the routing tables contain a
domain name, an SRV query is performed. The
device uses the first host name received from the
SRV query. The device then performs a DNS A-
record query for the host name to locate an IP
address.
■ [2] NAPTR = An NAPTR query is performed. If it is
successful, an SRV query is sent according to the
information received in the NAPTR response. If the
NAPTR query fails, an SRV query is performed
according to the configured transport type.
Note:
■ If the Proxy/Registrar IP address parameter, the
domain name in the Contact/Record-Route
headers, or the IP address configured in the routing
tables contain a domain name with a port definition,
the device performs a regular DNS A-record query.
■ If a specific Transport Type is configured, a NAPTR
query is not performed.
■ To enable NAPTR/SRV queries for Proxy servers
only, use the global parameter
ProxyDNSQueryType, or use the Proxy Sets table.
Global parameter that defines the DNS query record
type for resolving the Proxy server's configured domain
name (FQDN) into an IP address.
■ [0] A-Record = (Default) A-record DNS query.
■ [1] SRV = If the Proxy IP address parameter
contains a domain name without port definition (e.g.,
ProxyIP = domain.com), an SRV query is
performed. The SRV query returns up to four Proxy
host names and their weights. The device then
performs DNS A-record queries for each Proxy host
name (according to the received weights) to locate
up to four Proxy IP addresses. Thus, if the first SRV
query returns two domain names and the A-record
queries return two IP addresses each, no additional
searches are performed.
■ [2] NAPTR = NAPTR query is done. If successful,
an SRV query is sent according to the information
received in the NAPTR response. If the NAPTR
query fails, an SRV query is done according to the
configured transport type. If the Proxy IP address
parameter contains a domain name with port
definition (e.g., ProxyIP = domain.com:5080), the
device performs a regular DNS A-record query. If a
specific Transport Type is defined, a NAPTR query
is not performed.
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