AudioCodes Mediant 800B - Page 1111

Version 7.2 1111 Mediant 800B Gateway & E-SBC
User's Manual 72. Configuration Parameters Reference
Parameter 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.
Proxy DNS Query Type
configure voip > sip-definition
proxy-and-registration > proxy-
dns-query
[ProxyDNSQueryType]
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.
Note:
 This functionality can be configured per Proxy Set in the Proxy
Sets table (see 'Configuring Proxy Sets' on page 380).
 When enabled, NAPTR/SRV queries are used to discover
Proxy servers even if the parameter DNSQueryType is
disabled.
Use Gateway Name for
OPTIONS
configure voip > sip-definition
Determines whether the device uses its IP address or string
name ("gateway name") in keep-alive SIP OPTIONS messages
(host part of the Request-URI). To configure the "gateway name",
use the SIPGatewayName parameter. The device uses the