Alternative Routing For Tel-To-Ip Calls - AudioCodes Mediant 800B User Manual

These parameters are configured in the Routing General Parameters page
(Configuration tab > VoIP menu > GW and IP to IP > Routing > General
Parameters), as shown below:
Figure ‎ 2 3-5: IP Connectivity Method in Routing General Parameters Page

Quality of Service (QoS): You can enable the device to check the QoS of IP
destinations. The device measures the QoS according to RTCP statistics of previously
established calls with the IP destination. The RTCP includes packet delay (in
milliseconds) and packet loss (in percentage). If these measured statistics exceed a
user-defined threshold, the destination is considered unavailable. Note that if call
statistics is not received within two minutes, the QoS data is reset. These thresholds
are configured using the following parameters:

'Max Allowed Packet Loss for Alt Routing' (IPConnQoSMaxAllowedPL): defines
the threshold value for packet loss after which the IP destination is considered
unavailable.

'Max Allowed Delay for Alt Routing' (IPConnQoSMaxAllowedDelay): defines the
threshold value for packet delay after which the IP destination is considered
unavailable
These parameters are configured in the Routing General Parameters page, as shown
below:
Figure ‎ 2 3-6: IP QoS Thresholds in Routing General Parameters Page

DNS Resolution: When a host name (FQDN) is used (instead of an IP address) for
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:

Outbound IP Routing Table: The connectivity status of the IP destination per routing
rule is displayed in the 'Status' column. For more information, see 'Configuring
Outbound IP Routing Table' on page 323.

IP Connectivity: This page displays a more informative connectivity status of the IP
destinations used in Tel-to-IP routing rules in the Outbound IP Routing table. For
viewing this page, see 'Viewing IP Connectivity' on page 589.
23.5

Alternative Routing for Tel-to-IP Calls

The device supports various alternative Tel-to-IP call routing methods, as described in this
section.
23.5.1 Alternative Routing Based on IP Connectivity
You can configure the device to do alternative Tel-to-IP call routing based on IP
connectivity. When the connectivity state of an IP destination is unavailable, the device
attempts to re-route the Tel-to-IP call to an alternative IP destination. It does this by
searching for the next call matching rule (e.g., phone number prefix) in the Outbound IP
Routing table.
User's Manual 336
Mediant 800B GW & E-SBC
Document #: LTRT-10274