Installation & Operation Manual 548 Document # LTRT-92224
Mediant 8000
40.1.2 Redundancy Mechanisms
For each Proxy set, one of the following mechanisms for switching between SIP Proxy
server addresses are available:
Proxy Keep Alive Redundancy
Media Gateway board periodically sends keep-alive messages to the SIP Proxy
Server. If there is no response from the Primary Proxy, Media Gateway board
tries to communicate with Redundant Proxies. When a Redundant Proxy is found,
the Media Gateway starts using it. When connection with the Primary Proxy is
restored, Media Gateway board may either immediately revert to it or continue
using the current Redundant Proxy until a failure occurs.
See the parameters Enable Proxy Keep Alive and Redundancy Mode.
Proxy Hot Swap Redundancy
Media Gateway board can also provide real-time switching (Hot Swap) between
the Primary and Redundant Proxies (see Enable Proxy Hot Swap parameter). If
the first Proxy does not respond to an INVITE message, the same INVITE
message is immediately sent to the second Proxy. See the parameters Enable
Proxy Hot Swap and Proxy Hot Swap Retx.
40.1.3 DNS Service Records (SRV)
DNS Service Records (SRV) may be used to discover the SIP Proxy servers when
their Proxy IP parameter contains a domain name. See the parameter DNS Query
Type in the SIP Protocol Settings table.
For fallback routing, when communication with the SIP Proxy is lost, or for traffic load
balancing, you can use internal routing tables (Tel to IP) inside the Media Gateway
board. See the parameters Preferred Routing Table and Always Use Proxy in the
SIP Proxy Set table.
40.1.4 SIP Proxy Sets
This section describes how to configure SIP Proxy sets.
To configure SIP Proxy sets:
1. Click
to access the Media Gateway status screen.
2. Select the desired Media Gateway SIP board.
3. In the Navigation pane, select SIP
SIP General and then in the configuration
pane, click SIP Protocol Settings; the SIP Protocol Settings screen is displayed.
4. In the Proxy Settings tab, set Enable Proxy to Yes and configure additional
parameters as described in the table “SIP Proxy Settings” below.
5. In the Navigation pane, select SIP
SIP General Proxy Set; the SIP Proxy
Sets list is displayed.
6. Use the
or buttons to add or remove entries.
7. Select a specific row in the Proxy Sets list and then in the configuration pane,
select Proxy Set Settings; the Proxy Set Settings screen is displayed.
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