User's Manual 546 Document #: LTRT-10632
Mediant 800B Gateway & E-SBC
the device attempts to re-route the call to the next proxy destination, and so on until an
available IP destination is located. To enable the Proxy Redundancy feature for a
Proxy Set, set the IsProxyHotSwap parameter to 1 and the EnableProxyKeepAlive
parameter to 1.
When the Proxy Redundancy feature is enabled, the device continually monitors the
connection with the proxies by using keep-alive messages (SIP OPTIONS). The
device sends these messages every user-defined interval (ProxyKeepAliveTime
parameter). If the first (primary) proxy in the list replies with a SIP response code that
you have also configured by the 'Keep-Alive Failure Responses' parameter, the device
considers the Proxy as down; otherwise, the device considers the proxy as "alive". If
the proxy is still considered down after a user-defined number of re-transmissions
(configured by the HotSwapRtx parameter), the device attempts to communicate
(using the same INVITE) with the next configured (redundant) proxy in the list, and so
on until an available redundant proxy is located. Once an available proxy is located,
the device can operate in one of the following modes (configured by the
ProxyRedundancyMode parameter):
• Parking mode: The device continues operating with the redundant proxy (now
active) until the next failure occurs, after which it switches to the next redundant
proxy.
• Homing mode: The device always attempts to operate with the primary proxy. In
other words, it switches back to the primary proxy whenever it's available again.
If none of the proxy servers respond, the device goes over the list again.
Note:
• The device assumes that all the proxy servers belonging to the Proxy Set are
synchronized with regards to registered users. Thus, when the device locates an
available proxy using the Hot Swap feature, it does not re-register the users; new
registration (refresh) is done as normal.
• You can also enable the Busy Out feature, whereby the device can take specified
actions if all Proxy Sets of associated destination IP Groups of matching routing
rules in the Tel-to-IP Routing table do not respond to connectivity checks. For
more information, see the EnableBusyOut parameter.
• If the AltRoutingTel2IPEnable parameter is enabled for the IP Connectivity feature
(see Alternative Routing Based on IP Connectivity on page 542), the Busy Out
feature does not function with the Proxy Set keep-alive mechanism (see below).
To use the Busy Out feature with the Proxy Set keep-alive mechanism (for IP
Groups), disable the AltRoutingTel2IPEnable parameter.
The following procedure describes how to configure alternative Tel-to-IP routing based on
SIP response codes through the Web. You can also configure it through ini file
(AltRouteCauseTel2Ip) or CLI (configure voip > gateway routing alt-route-cause-tel2ip).
 To configure alternative Tel-to-IP routing based on SIP response codes:
1. Configure SIP response codes (call failure reasons) that invoke alternative Tel-to-IP
routing:
a. Open the Reasons for Tel-to-IP Alternative Routing table (Setup menu >
Signaling & Media tab > Gateway folder > Routing > Alternative Routing
Reasons > Reasons for Tel > IP).
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