AudioCodes E-SBC User Manual

CHAPTER15 Media
Mediant 1000 Gateway & E-SBC | User's Manual
Event
Type
Subtype Description and Required Configuration
■ voice-end
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, using the parameters SITQ850Cause, SITQ850CauseForNC, SITQ850CauseForIC,
SITQ850CauseForVC, and SITQ850CauseForRO.
This feature is applicable only to the Gateway application.
Table 15-2: SIT Reported by the Device
Special
Information
Tones (SITs)
Name
Description
First Tone
Frequency
Duration
Second Tone
Frequency
Duration
Third Tone
Frequency
Duration
(Hz) (ms) (Hz) (ms) (Hz) (ms)
NC1 No circuit found 985.2 380 1428.5 380 1776.7 380
IC Operator
intercept
913.8 274 1370.6 274 1776.7 380
VC Vacant circuit
(non registered
number)
985.2 380 1370.6 274 1776.7 380
RO1 Reorder
(system busy)
913.8 274 1428.5 380 1776.7 380
NC* - 913.8 380 1370.6 380 1776.7 380
RO* - 985.2 274 1370.6 380 1776.7 380
IO* - 913.8 380 1428.5 274 1776.7 380
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:
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AudioCodes E-SBC Specifications

General

Brand	AudioCodes
Model	E-SBC
Category	Gateway
Language	English