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SIP User's Manual 160 Document #: LTRT-65411

MediaPack Series

Parameter Description

Max Allowed Packet Loss for

Alt Routing [%]

[IPConnQoSMaxAllowedPL]

Packet loss percentage at which the IP connection is considered a

failure and Alternative Routing mechanism is activated.

The range is 1 to 20%. The default value is 20%.

Max Allowed Delay for Alt

Routing [msec]

[IPConnQoSMaxAllowedDel

ay]

Transmission delay (in msec) at which the IP connection is

considered a failure and Alternative Routing mechanism is activated.

The range is 100 to 1000. The default value is 250.

3.4.4.4.2 Tel to IP Routing Table

The 'Tel to IP Routing' page provides a table for configuring up to up to 50 routing rules for

Tel-to-IP calls, where Tel calls are routed to destinations based on IP address (or IP

Group).

Note: The 'Tel to IP Routing' page appears only if the parameter EnableSBC is set

to 0 (default) in SBC Configuration. If this parameter is enabled, the

'Outbound IP Routing Table' page appears instead (refer to Outbound IP

Routing Table for a description of this page).

This routing table associates called and/or calling telephone number prefixes (originating

from a specific Hunt Group), with a destination IP address (or Fully Qualified Domain Name

- FQDN) or IP Group. When a call is routed by the device (i.e., a Proxy server isn't used),

the called and calling numbers are compared to the list of prefixes in this table. Calls that

match these prefixes are sent to the corresponding IP address. If the number dialed does

not match these prefixes, the call is not made.

When using a Proxy server, you do not need to configure this table unless you require one

of the following:

 Fallback routing when communication with Proxy servers is lost.

 Implement the 'Filter Calls to IP' and 'IP Security' features.

 Obtain different SIP URI host names (per called number).

 Assign IP profiles.

Note that for this table to take precedence over a Proxy for routing calls, set the parameter

PreferRouteTable to 1. The device checks the 'Destination IP Address' field in this table for

a match with the outgoing call. A Proxy is used only if a match is not found.

Possible uses for Tel-to-IP routing include the following:

 Fallback to internal routing table if there is no communication with the Proxy servers.

 Call Restriction (when Proxy isn't used): rejects all outgoing Tel-to-IP calls that are

associated with the destination IP address 0.0.0.0.

 IP Security: When the IP Security feature is enabled (SecureCallFromIP = 1), the

device accepts only those IP-to-Tel calls with a source IP address defined in the 'Tel to

IP Routing' table.

 Filter Calls to IP: When a Proxy is used, the device checks the 'Tel to IP Routing' table

before a telephone number is routed to the Proxy. If the number is not allowed

(number isn't listed or a Call Restriction routing rule is applied), the call is released.

 Always Use Routing Table: When this feature is enabled (AlwaysUseRouteTable = 1),

even if a Proxy server is used, the SIP URI host name in the sent INVITE message is

obtained from this table. Using this feature, you can assign a different SIP URI host

name for different called and/or calling numbers.

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