AudioCodes Mediant 3000 User Manual page 607

User's Manual
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.
Special Information Tones (SITs) Reported by the device
Special
Information
Tones (SITs)
Name
NC1 No circuit found
Operator intercept
IC
VC Vacant circuit (non
registered number)
RO1 Reorder (system busy)
NC* -
RO* -
IO* -
For example:
INFO sip:5001@10.33.2.36 SIP/2.0
Via: SIP/2.0/UDP 10.33.45.65;branch=z9hG4bKac2042168670
Max-Forwards: 70
From: <sip:5000@10.33.45.65;user=phone>;tag=1c1915542705
To: <sip:5001@10.33.2.36;user=phone>;tag=WQJNIDDPCOKAPIDSCOTG
Call-ID: AIFHPETLLMVVFWPDXUHD@10.33.2.36
CSeq: 1 INFO
Contact: <sip:2206@10.33.45.65>
Supported: em,timer,replaces,path,resource-priority
Content-Type: application/x-detect
Content-Length: 28
Type= CPT
SubType= SIT-IC
The X-Detect event notification process is as follows:
1. For IP-to-Tel or Tel-to-IP calls, the device receives a SIP request message (using the
X-Detect header) that the remote party wishes to detect events on the media stream.
For incoming (IP-to-Tel) calls, the request must be indicated in the initial INVITE and
responded to either in the 183 response (for early dialogs) or in the 200 OK response
(for confirmed dialogs).
2. Once the device receives such a request, it sends a SIP response message (using the
X-Detect header) to the remote party, listing all supported events that can be detected.
The absence of the X-Detect header indicates that no detections are available.
3. Each time the device detects a supported event, the event is notified to the remote
party by sending an INFO message with the following message body:
•
Content-Type: application/X-DETECT
Version 6.6
using the parameters
Description
Frequency Duration
985.2
913.8
985.2
913.8
913.8
985.2
913.8
48. Reporting Information to External Party
SITQ850Cause,
First Tone
Frequency Duration
(Hz) (ms)
380
274
380
274
380
274
380
607
SITQ850CauseForNC,
Second Tone
(Hz) (ms) (Hz)
1428.5 380 1776.7
1370.6 274 1776.7
1370.6 274 1776.7
1428.5 380 1776.7
1370.6 380 1776.7
1370.6 380 1776.7
1428.5 274 1776.7
Mediant 3000
Third Tone
Frequency
Duration
(ms)
380
380
380
380
380
380
380