Version 7.0 515 Mediant 3000
User's Manual 25. Routing
Table 25-7: Alternative Routing based on SIP Response Code Example
Destination
Phone Prefix
IP Destination SIP Response Rule Used?
Main Route
40 10.33.45.68
408 Request
Timeout
No
Alternative Route #1
40 10.33.45.70 486 Busy Here No
Alternative Route #2
40 10.33.45.72 200 OK Yes
Proxy Sets: Proxy Sets are used for Server-type IP Groups (e.g., an IP PBX or
proxy), which define the address (IP address or FQDN) of the server (see ''Configuring
Proxy Sets'' on page
355). As you can configure multiple IP destinations per Proxy
Set, the device supports proxy redundancy, which works together with the alternative
routing feature. If the destination of a routing rule in the Tel-to-IP Routing table is an IP
Group, the device routes the call to the IP destination configured for the Proxy Set
associated with the IP Group. If the first IP destination of the Proxy Set is unavailable,
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.
The steps for configuring alternative Tel-to-IP routing based on SIP response codes are
summarized below.
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:
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