Version 7.2 353 Mediant 1000B Gateway & E-SBC
User's Manual 17. Control Network
Parameter Description
address, the device selects the matching Proxy Set in the
following order:
Selects the Proxy Set whose IP address, port, and transport
type match the source of the incoming dialog (regardless of
the settings of this parameter).
If no match is found for above, it selects the Proxy Set
whose IP address and transport type match the source of
the incoming dialog (if the parameter is configured to IP
Address Only).
If no match is found for above, it selects the Proxy Set
whose IP address match the source of the incoming dialog
(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-
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.
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