Version 7.0 883 Mediant 3000
User's Manual 58. Configuration Parameters Reference
Parameter Description
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.
Notes:
 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 Set table.
Proxy DNS Query Type
[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.
Notes:
 This functionality can be configured per Proxy Set in the Proxy Set
table (see ''Configuring Proxy Sets'' on page 355).
 When enabled, NAPTR/SRV queries are used to discover Proxy
servers even if the parameter DNSQueryType is disabled.
Use Gateway Name for
OPTIONS
[UseGatewayNameForOpt
ions]
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 OPTIONS request as
a keep-alive message with its primary and redundant SIP proxy servers
(i.e., the EnableProxyKeepAlive parameter is set to 1).
 [0] No = (Default) Device's IP address is used in keep-alive
OPTIONS messages.

[1] Yes = Device's "gateway name" is used in keep-alive OPTIONS
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