AudioCodes Mediant 600 - Page 748

SIP User's Manual 748 Document #: LTRT-83310
Mediant 600 & Mediant 1000
Parameter Description
Web: Alt Routing Tel to IP Keep
Alive Time
EMS: Alternative Routing Keep
Alive Time
[AltRoutingTel2IPKeepAliveTime]
Defines the time interval (in seconds) between SIP OPTIONS
Keep-Alive messages used for the IP Connectivity application.
The valid range is 5 to 2,000,000. The default value is 60.
Web/EMS: Alternative Routing
Tone Duration [ms]
[AltRoutingToneDuration]
Defines the duration (in milliseconds) for which the device plays
a tone to the endpoint on each Alternative Routing attempt.
When the device finishes playing the tone, a new SIP INVITE
message is sent to the new destination. The tone played is the
Call Forward Tone (Tone Type #25 in the CPT file).
The valid range is 0 to 20,000. The default is 0 (i.e., no tone is
played).
Web: Max Allowed Packet Loss for
Alt Routing [%]
[IPConnQoSMaxAllowedPL]
Defines the packet loss (in percentage) at which the IP
connection is considered a failure and Alternative Routing
mechanism is activated.
The default value is 20%.
Web: Max Allowed Delay for Alt
Routing [msec]
[IPConnQoSMaxAllowedDelay]
Defines the transmission delay (in msec) at which the IP
connection is considered a failure and the Alternative Routing
mechanism is activated.
The range is 100 to 10,000. The default value is 250.
Reasons for Alternative Tel-to-IP Routing Table
Web: Reasons for Alternative
Routing
EMS: Alt Route Cause Tel to IP
[AltRouteCauseTel2IP]
This parameter table configures SIP call failure reason values
received from the IP side. If an IP call is released as a result of
one of these reasons, the device attempts to locate an
alternative IP route (address) for the call in the Outbound IP
Routing Table (if a Proxy is not used) or used as a redundant
Proxy (you need to set the parameter RedundantRoutingMode
to 2). The release reason for Tel-to-IP calls is provided in SIP
4xx, 5xx, and 6xx response codes.
The format of this parameter is as follows:
[AltRouteCauseTel2IP]
FORMAT AltRouteCauseTel2IP_Index =
AltRouteCauseTel2IP_ReleaseCause;
[\AltRouteCauseTel2IP]
For example:
AltRouteCauseTel2IP 0 = 486; (Busy Here)
AltRouteCauseTel2IP 1 = 480; (Temporarily Unavailable)
AltRouteCauseTel2IP 2 = 408; (No Response)
Notes:
 This parameter can include up to 5 indices.
 The reasons for alternative routing for Tel-to-IP calls apply
only when a Proxy is not used.
 When there is no response to an INVITE message (after
INVITE retransmissions), the device issues an internal 408
'No Response' implicit release reason.

The device sends the call to an alternative IP route only after
the call has failed and the device has subsequently
attempted twice to establish the call unsuccessfully.
 The device also plays a tone to the endpoint whenever an
alternative route is used. This tone is played for a user-
defined time (configured by the parameter
AltRoutingToneDuration).