User's Manual
512
Document #: LTRT-10375
Mediant 500 MSBR
the IP destination, it is resolved into an IP address by a DNS server. The device
checks network connectivity and QoS of the resolved IP address. If the DNS host
name is unresolved, the device considers the connectivity of the IP destination as
unavailable.
You can view the connectivity status of IP destinations in the following Web interface
pages:
Tel-to-IP Routing table:
The connectivity status of the IP destination per routing rule
is displayed in the 'Status' column. For more information, see Configuring Tel-to-IP
Routing Rules on page 495.
IP Connectivity:
This page displays a more informative connectivity status of the IP
destinations used in Tel-to-IP routing rules in the Tel-to-IP Routing table. For viewing
this page, see Viewing IP Connectivity on page 870.
27.4.2 Alternative Routing Based on IP Connectivity
You can configure the device to route Tel-to-IP calls to an alternative IP destination when
the connectivity state of an IP destination is unavailable. The alternative routing rules are
configured in the Tel-to-IP Routing table. These rules must be configured anywhere below
the "main" routing rule and with identical matching characteristics (e.g., destination prefix
number) to the "main" routing rule. The device uses the first alternative route that is
available. For more information on configuring alternative Tel-to-IP routing rules in the Tel-
to-IP Routing table, see Configuring Tel-to-IP Routing Rules on page 495.
Note:
Alternative routing based on IP connectivity is applicable only when a proxy server
is
not
used.
You can also enable the Busy Out feature, whereby the device can take specified
actions if all IP destinations 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, the Busy Out feature does not
function with the Proxy Set keep-alive mechanism (see Alternative Routing Based
on SIP Responses on page 514). To use the Busy Out feature with the Proxy Set
keep-alive mechanism (for IP Groups), disable the AltRoutingTel2IPEnable
parameter.
The device searches for an alternative routing rule (IP destination) when any of the
following connectivity states are detected with the IP destination of the "main" routing rule:
No response received from SIP OPTIONS messages. This depends on the chosen
method for checking IP connectivity.
Poor QoS according to the configured thresholds for packet loss and delay.
No response from a DNS-resolved IP address, where the domain name (FQDN) is
configured for the IP destination. If the device sends the INVITE message to the first
IP address and receives no response, the device makes a user-defined number of
attempts (configured by the HotSwapRtx parameter) to send it again (re-transmit). If
there is still no response after all the attempts, it sends it to the next DNS-resolved IP
address, and so on. For example, if you configure the parameter to "3" and the device
receives no response from the first IP address, it attempts up to three times to send
the INVITE to the first IP address and if unsuccessful, it attempts to send the call to
the next DNS-resolved IP address, and so on.
No response for in-dialog request from a DNS-resolved IP address, where the domain
name is received in the Contact header of an incoming setup or target refresh SIP
message (e.g., 200 OK). If no response is received from the first IP address, the
Summary of Contents for Mediant 500 MSBR
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Page 137: ...Part IV General VoIP Configuration ...
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Page 837: ...Part X Status Performance Monitoring and Reporting ...
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Page 927: ...Part XI Diagnostics ...
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Page 977: ...Part XII Appendix ...
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