AudioCodes Mediant 600 - Configuring NAT Translation Per IP Interface

SIP User's Manual 204 Document #: LTRT-83310
Mediant 600 & Mediant 1000
Parameter Description
FQDN should be configured as a Proxy IP address. The Random
Weights Load Balancing is not used in the following scenarios:
 The Proxy Set includes more than one Proxy IP address.
 The only Proxy defined is an IP address and not an FQDN.
 SRV is not enabled (DNSQueryType).
 The SRV response includes several records with a different Priority
value.
Web/EMS: Is Proxy Hot-
Swap
[ProxySet_IsProxyHotSwa
p]
Enables the Proxy Hot-Swap redundancy mode per Proxy Set.
 [0] No (default)
 [1] Yes
If Proxy Hot-Swap is enabled, the SIP INVITE/REGISTER message is
initially sent to the first Proxy/Registrar server. If there is no response
from the first Proxy/Registrar server after a specific number of
retransmissions (configured by the parameter HotSwapRtx), the
message is resent to the next redundant Proxy/Registrar server.
Web/EMS: Redundancy
Mode
[ProxySet_ProxyRedunda
ncyMode]
Determines whether the device switches back to the primary Proxy
after using a redundant Proxy (per this Proxy Set).
 [-1] = Not configured – the “global” parameter
ProxyRedundancyMode applies (default).
 [0] Parking = The device continues operating with a redundant
(now active) Proxy until the next failure, after which it operates with
the next redundant Proxy.
 [1] Homing = The device always attempts to operate with the
primary Proxy server (i.e., switches back to the primary Proxy
whenever it's available).
Notes:
 To use the Proxy Redundancy mechanism, you need to enable the
keep-alive with Proxy option, by setting the parameter
EnableProxyKeepAlive to 1 or 2.
 If this parameter is configured, then the global parameter is
ignored.
Web/EMS: SRD Index
[ProxySet_ProxySet_SRD]
The SRD (defined in Configuring SRD Table on page 191) associated
with the Proxy Set ID.
Notes:
 For this parameter to take effect, a device reset is required.
 If no SRD is defined for this parameter, by default, SRD ID #0 is
associated with the Proxy Set.
14.5 Configuring NAT Translation per IP Interface
The NAT Translation table defines NAT rules for translating source IP addresses per VoIP
interface (SIP control and RTP media traffic) into NAT IP addresses (public or global). This
allows, for example, the separation of VoIP traffic between different ISTP’s, and topology
hiding of internal IP addresses to the “public” network. Each IP interface (configured in the
Multiple Interface table - InterfaceTable parameter) can be associated with a NAT rule in
this table, translating the source IP address and port of the outgoing packet into the NAT
address (IP address and port range).
The device’s priority method for performing NAT is as follows:
a. Uses an external STUN server (STUNServerPrimaryIP parameter) to assign a NAT
address to all interfaces.