AudioCodes MP-11x User Manual page 439

User's Manual
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 38-5: Special Information Tones (SITs) Reported by the device
Special Description
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
•
Type = [CPT | FAX | PTT...]
•
Subtype = xxx (according to the defined subtypes of each type)
Version 6.6
using the parameters
First Tone
Frequency
Duration
(Hz)
985.2
913.8
985.2
913.8
913.8
985.2
913.8
38. Reporting Information to External Party
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
439
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
MP-11x & MP-124