AudioCodes Mediant 500L - Page 386

User's Manual 386 Document #: LTRT-10532
Mediant 500L Gateway & E-SBC
Parameter Description
(if the parameter is configured to IP Address Only.
DNS Resolve Method
dns-resolve-method
[ProxySet_DNSResolveMethod]
Defines the DNS query record type for resolving the proxy server's
host name (FQDN) into an IP address(es).
 [-1] = Not configured. DNS resolution method is according to
the settings of the global parameter, ProxyDNSQueryType.
 [0] A-Record = (Default) DNS A-record query is used to resolve
DNS to IP addresses.
 [1] SRV = If the proxy address is configured with a domain
name without a port (e.g., domain.com), an SRV query is done.
The SRV query returns the host names (and their weights). The
device then performs DNS A-record queries per host name
(according to the received weights). If the configured proxy
address contains a domain name with a port (e.g.,
domain.com:5080), the device performs a regular DNS A-
record
query.
 [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
configured proxy address contains a domain name with a port
(e.g., domain.com:5080), the device performs a regular DNS A-
record query. If the transport type is configured for the proxy
address, a NAPTR query is not performed.
 [3] Microsoft Skype for Business = SRV query as required by
Microsoft when the device is deployed in a Microsoft Skype for
Business environment. The device sends a special SRV query
to the DNS server according to the transport protocol
configured
in the 'Transport Type' parameter (described later in this
section):

TLS: "_sipinternaltls_tcp.<domain>" and
"_sip_tls.<domain>". For example, if the configured domain
name (in the 'Proxy Address' parameter) is "ms-
server.com", the device queries for "_sipinternaltls_tcp.ms-
server.com" and "_sip_tls.ms-server.com".

TCP: "_sipinternal._tcp.<domain>" and
"_sip_tcp.<domain>".

Undefined: "_sipinternaltls_tcp.<domain>",
"_sipinternal_tcp.<domain>", "_sip_tls.<domain>" and
"_sip_tcp.<domain>".
The SRV query returns the host names (and their weights). The
device then performs DNS A-record queries per host name
(according to the received weights) to resolve into IP addresses.
Note: An SRV query can return up to four host names. For each
host name, the subsequent DNS A-record query can resolve into
up to 15 IP addresses. However, the device supports up to 30
DNS-resolved IP addresses. If the device receives more than this
number of IP addresses, it uses the first 30 IP addresses in the
received list and ignores the rest.
Proxy Address Table
Index
proxy-ip-index
[ProxyIp_ProxyIpIndex]
Defines an index number for the new table row.
Note: Each row must be configured with a unique index.