AudioCodes E-SBC User Manual page 1187

CHAPTER 68 Configuration Parameters Reference
'DNS Query Type'
configure voip > sip-
definition proxy-and-
registration > dns-query
[DNSQueryType]
'Proxy DNS Query Type'
configure voip > sip-
definition proxy-and-
registration > proxy-dns-
query
[ProxyDNSQueryType]
Parameter
Mediant 1000 Gateway & E-SBC | User's Manual
Description
■ When the parameter is set to [2] and the INVITE
fails, the device re-routes the call according to the
Standard mode [0]. If DNS resolution fails, the
device attempts to route the call to the Proxy. If
routing to the Proxy also fails, the Redirect/Transfer
request is rejected.
■ When the parameter is set to [2], the XferPrefix
parameter can be used to define different routing
rules for redirect calls.
■ The parameter is disregarded if the parameter
AlwaysSendToProxy is set to 1.
Enables the use of DNS Naming Authority Pointer
(NAPTR) and Service Record (SRV) queries to resolve
Proxy and Registrar servers and to resolve all domain
names that appear in the SIP Contact and Record-
Route headers.
■ [0] A-Record = (Default) No NAPTR or SRV
queries are performed.
■ [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.
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