AudioCodes E-SBC User Manual

CHAPTER23 Digital PSTN
Mediant 1000 Gateway & E-SBC | User's Manual
The device continuously monitors the established connections. If for some reason, one or more
calls are released, the device automatically re-establishes these ‘broken’ connections. When a
failure in a physical trunk or in the IP network occurs, the device re-establishes the tunneling
connections when the network is restored.
It's recommended to use the keep-alive mechanism for each connection, by activating
the ‘session expires’ timeout and using Re-INVITE messages.
The device supports the configuration (TDMoIPInitiateInviteTime and TDMoIPInviteRetryTime
parameters) of the following timers for the TDM-over-IP tunneling application:
■ Time between successive INVITEs sent from the same trunk.
■ Time between call release and the new INVITE that is sent on the same channel. The call can
be released if the device receives a 4xx or 5xx response.
By using Profiles (see Configuring Tel Profiles), you can configure the TDM Tunneling feature to
choose different settings based on a timeslot or groups of timeslots. For example, you can use low-
bit-rate vocoders to transport voice and ‘Transparent’ coder to transport data (e.g., for D-channel).
You can also use Profiles to assign ToS (for DiffServ) per source - a timeslot carrying data or
signaling is assigned a higher priority value than a timeslot carrying voice.
For tunneling CAS trunks, set the protocol type to 'Raw CAS' (ProtocolType = 3 / 9) and enable
RFC 2833 CAS relay mode ('CAS Transport Type' parameter is set to 'CAS RFC2833 Relay').
For TDM over IP, the parameter CallerIDTransportType must be set to '0' (disabled),
i.e., transparent.
Below is an example of ini files for two devices implementing TDM Tunneling for four E1 spans.
Note that in this example both devices are dedicated to TDM tunneling.
■ Terminating Side:
EnableTDMOverIP = 1
;E1_TRANSPARENT_31
ProtocolType_0 = 5
ProtocolType_1 = 5
ProtocolType_2 = 5
ProtocolType_3 = 5
[PREFIX]
FORMAT PREFIX_Index = PREFIX_RouteName, PREFIX_DestinationPrefix,
PREFIX_DestAddress, PREFIX_SourcePrefix, PREFIX_ProfileName, PREFIX_
MeteringCode, PREFIX_DestPort, PREFIX_DestIPGroupName, PREFIX_
TransportType, PREFIX_SrcTrunkGroupID, PREFIX_DestSIPInterfaceName,
PREFIX_CostGroup, PREFIX_ForkingGroup, PREFIX_CallSetupRulesSetId,
PREFIX_ConnectivityStatus;
Prefix 1 = TunnelA,*,10.8.24.12;
[\PREFIX]
;IP address of the device in the opposite
;location
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AudioCodes E-SBC Specifications

General

Brand	AudioCodes
Model	E-SBC
Category	Gateway
Language	English