Sit Event Detection - AudioCodes Mediant 800B User Manual

Event
Type

modem

voice-start
PTT

voice-end

14.4.1 SIT Event Detection

The device can detect and report the following Special Information Tones (SIT) types from
the PSTN:

SIT-NC (No Circuit found)

SIT-IC (Operator Intercept)

SIT-VC (Vacant Circuit - non-registered number)

SIT-RO (Reorder - System Busy)
There are additional three SIT tones that are detected as one of the above SIT tones:

The NC* SIT tone is detected as NC

The RO* SIT tone is detected as RO

The IO* SIT tone is detected as VC
The device can map these SIT tones to a Q.850 cause and then map them to SIP 5xx/4xx
responses,
SITQ850CauseForIC, SITQ850CauseForVC, and SITQ850CauseForRO.
Table 14-2: Special Information Tones (SITs) Reported by the device
Special Description
Information
Tones (SITs)
Name
NC1 No circuit found
IC Operator intercept
VC Vacant circuit (non
registered number)
RO1 Reorder (system
busy)
NC* -
RO* -
IO* -
The following example shows a SIP INFO message sent by the device to a remote
application server notifying it that SIT detection has been detected:
User's Manual
Subtype
using the parameters
First Tone
Frequency
Duration
(Hz)
985.2
913.8
985.2
913.8
913.8
985.2
913.8
Mediant 800B Gateway & E-SBC
Description and Required Configuration
than 0.
- or -

Set the IsFaxUsed parameter to 0 and the
FaxTransportMode parameter to any value other
than 0.
Set the VxxModemTransportType parameter to 3.
Set the EnableDSPIPMDetectors parameter to 1.
SITQ850Cause,
Second Tone
Frequency
Duration
(ms) (Hz)
380 1428.5
274 1370.6
380 1370.6
274 1428.5
380 1370.6
274 1370.6
380 1428.5
202
SITQ850CauseForNC,
Third Tone
Frequency
Duration
(ms) (Hz) (ms)
380 1776.7 380
274 1776.7 380
274 1776.7 380
380 1776.7 380
380 1776.7 380
380 1776.7 380
274 1776.7 380
Document #: LTRT-10298