
V7122 Gateway User Guide
253
The X-Detect event notification process is as follows:
1
For IP-to-Tel or Tel-to-IP calls, the gateway 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). For outgoing calls (Tel-to-IP), the request may be received in the 183
(for early dialogs) and responded to in the PRACK, or received in the 200 OK (for
confirmed dialogs) and responded to in the ACK.
2
Once the gateway 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 gateway 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 = [AMD | CPT | FAX | PTT…]
Subtype = xxx (according to the defined subtypes of each type)
Below is an example of SIP messages implementing the X-Detect header:
INVITE sip:[email protected];user=phone SIP/2.0
Via: SIP/2.0/UDP 10.33.2.53;branch=z9hG4bKac5906
Max-Forwards: 70
From: "anonymous" <sip:[email protected]>;tag=1c25298
To: <sip:[email protected];user=phone>
Call-ID: [email protected]
CSeq: 1 INVITE
Contact: <sip:[email protected]>
X- Detect: Request=CPT,FAX
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.33.2.53;branch=z9hG4bKac5906
From: "anonymous" <sip:[email protected]>;tag=1c25298
To: <sip:[email protected];user=phone>;tag=1c19282
Call-ID: [email protected]
CSeq: 1 INVITE
Contact: <sip:[email protected]>
X- Detect: Response=CPT,FAX
INFO sip:[email protected];user=phone SIP/2.0
Via: SIP/2.0/UDP 10.33.2.53;branch=z9hG4bKac5906
Max-Forwards: 70
From: "anonymous" <sip:[email protected]>;tag=1c25298
To: <sip:[email protected];user=phone>
Call-ID: [email protected]
CSeq: 1 INVITE
Contact: <sip:[email protected]>
X- Detect: Response=CPT,FAX
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