AudioCodes Mediant 800B User Manual page 692

Table 49-7: 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* -
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)
Below is an example of SIP messages using the X-Detect header:
INVITE sip:101@10.33.2.53;user=phone SIP/2.0
Via: SIP/2.0/UDP 10.33.2.53;branch=z9hG4bKac5906
Max-Forwards: 70
From: "anonymous" <sip:anonymous@anonymous.invalid>;tag=1c25298
To: <sip:101@10.33.2.53;user=phone>
Call-ID: 11923@10.33.2.53
User's Manual
First Tone Second Tone
Frequency
Duration
(Hz) (ms) (Hz)
985.2 380 1428.5
913.8 274 1370.6
985.2 380 1370.6
913.8 274 1428.5
913.8 380 1370.6
985.2 274 1370.6
913.8 380 1428.5
692
Mediant 800B Gateway and E-SBC
Third Tone
Frequency Frequency
Duration Duration
(ms) (Hz)
380 1776.7
274 1776.7
274 1776.7
380 1776.7
380 1776.7
380 1776.7
274 1776.7
Document #: LTRT-10286
(ms)
380
380
380
380
380
380
380