Internet DRAFT - draft-cgkim-sipping-info
draft-cgkim-sipping-info
Choon Kyu Kim
Internet Draft Ki Won Ko
Document: draft-cgkim-sipping-info-00.txt KT
Expires: 2004-08 February 2004
A SIP application using INFO message for IP premise control
Status of this Memo
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Abstract
This document describes the INFO usage for IP-surveillance
application. SIP is used as a means of incorporating terminals of
different vendors. In this draft, mid-control
commands, for example, retrieving server images or saving images in
the server are defined and delivered as session names of INVITE messages.
IN addition to that, INFO definitions specific to the
application are described. For example, camera control like PTZ(Pen,
Tilt, Zoom) information is defined for the purpose of
standardization of controls.
Table of Contents
Status of this memo . . . . . . . . . . . . . . . . .. . . . 1
Abstract .. . . . . . . . . . . . . . . . . . . . .. . . . 1
1. Overview .. . . . . . . . . . . . . . . . . . . . .. . . . 2
2. Appication architecture . . . . . . . . . . . . . .. . . . 2
3. Service Examples . . . . . . . . . . . . . . . . .. . . . 3
4. Real time session control . . . . . . . . . . . . .. . . . 4
5. INFO usage example . . . . . . . . . . . . . . . .. . . . 5
Choon Kyu Kim
A SIP application using INFO message for IP premise control 1
1. Overview
SIP applications are increasing for its simplicity and possible
versatility of its usage. For a specific application that is not
traditional, SIP is clearly under-specified and requires creation
of protocols that is proprietary. In this document, I will give an
example of such an application and propose definitions specific for
this application.
2. Application architecture
We are concerned to implement a system that UAs in one side (B in
Figure 1) are consist of cameras and UAs in the other side (A in
Figure 1) are user clients that will receive live streams from
UAs(B) directly or through the media server that stores images in
real time.
We have two definitions that are quite proprietary in this
application.
Firstly, we need a consistent way of delivering action commands of
UA(A) for storing images for a certain period of time, retrieving
stored images and executing commands for device controls.
UA(B) controls cameras. Secondly, therefore, the application needs
to be capable of handling camera specific controls
(A) +---------+ (B)
+----+ | Proxy | +----+
| UA | <---------> | | <------------------> | UA |
+----+ +---------+ +----+
^
|
|
V
+----------+
| Media |
| Server |
+----------+
Figure 1 - Basic Architecture
Choon Kyu Kim
A SIP application using INFO message for IP premise control
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3. Scenario examples
To retrieve stored files or images, we use session name esi to give
commands to server. Usages of s=vsr(video search request),
s=vsa(video search acknowledgement) are presented below 1 and 2.
The required files are specified by the time eti parameters.
3.1 Request for video retrival
INVITE sip:sipd@127.0.0.1 SIP/2.0
Via: SIP/2.0/UDP 127.0.0.1:5060
To: SIPd<sip:sipd@127.0.0.1>
From: <sip:-@127.0.0.1:5060>
Call-ID: bbe8aa46f9217ee10a5805b00507a0c9@127.0.0.1
CSeq: 1 INVITE
Subject: video_search
Contact: <sip:-@127.0.0.1:5060>
Contact: <sip:contact@127.0.0.1>
Content-Type: application/sdp
Content-Length: 66
v=0
o=mhandley 2890844526 2890842807 IN IP4 126.16.64.4
s= vsr
t= 2873397496 2873404696
t= 2873404696 2873405696
3.2. Acknowledgement for the video retrival
Via: SIP/2.0/UDP 127.0.0.1:5060
To: destination<sip:destination@127.0.0.1>;tag=ff21b1b4
From: <sip:-@127.0.0.1:5060>
Call-ID: bbe8aa46f9217ee10a5805b00507a0c9@127.0.0.1
CSeq: 1 ACK
Content-Type: application/sdp
Max-Forwards: 70
Content-Length: 114
v=0
o=SIPd 2890844526 2890842807 IN IP4 126.16.64.4
s= vsa
4. Real-time session control
An example session establishment is described below.
Choon Kyu Kim
A SIP application using INFO message for IP premise control
3
UA(B) establishes a session with media server through proxy server
to store image. UA(A) can access stored images as explained in 3.
Scenario examples.
To view live images, we choose a scenario that UA(A) establishes a
session through proxy server with UA(B). UA(B) requires ability to
open 2 sessions simultaneously. This direct session is also useful
for real time controls of UA(B) device if such functions are
available. Examples are PTZ controls of surveillance cameras.
UA(A) Proxy Media Server UA(B)
| | | |
| | | INVITE |
| |<---------------------------|
| | INVITE | |
| |------------->| |
| | OK | |
| |<-------------| |
| | OK | |
| |--------------------------->|
| | | ACK |
| |<---------------------------|
| | ACK | |
| |------------->| |
| | | RTP |
| | |<===========>|
| INVITE | | |
|--------------->| INVITE |
| |--------------------------->|
| | OK |
| OK |<---------------------------|
|<---------------| | |
| ACK | | |
|--------------->| ACK |
| |--------------------------->|
| RTP |
|<===========================================>|
| | | |
| INFO | | |
|--------------->| INFO |
| |--------------------------->|
| | OK |
| |<---------------------------|
| OK | | |
|<---------------| | |
| ACK | | |
|--------------->| ACK |
| |--------------------------->|
| | | |
| | | |
| | | |
| | | |
| | |
Choon Kyu Kim
A SIP application using INFO message for IP premise control
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5. INFO usage examples.
5.1 request for PTZ control
INFO sip:147.6.70.227:5060 SIP/2.0
From: <sip:-@147.6.70.223:5060>
To: <sip:000013@147.6.70.227:5060;user=phone>
Call-ID: 000013@147.6.70.227:5060
CSeq: 1 INFO
Content-Type: application/PTZ
Content-Length: 41
PTZ control
The contents of the PTZ control are explained below.
F , I FOCUS IN
F , O FOCUS OUT
Z , I ZOOM IN
Z , O ZOOM OUT
U , U UP UP
R , U RIGHT UP
R , R RIGHT
R , D RIGHT DOWN
D , D DOWN
L , D RIGHT DOWN
L , L LEFT
L , U LEFT UP
A , A AUTOPAN
P , O POWER ON
P , F POWER OFF
L , O LAMP POWER ON
L , F LAMP POWER OFF
A , O ASSIST ON
A , F ASSIST OFF
S , O PRESET ON
S , F PRESET OFF
References
[1] Donovan, S., "The SIP INFO Method" RFC 2976, October 2000
Author's Addresses
Choon Kyu Kim
KT
Suh Cho Gu, Wu Myun Dong 17 Phone: 82-2-526-5760
Choon Kyu Kim
A SIP application using INFO message for IP premise control
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Seoul, Korea Email: cgkim@kt.co.kr
Ki Won Ko
KT
Suh Cho Gu, Wu Myun Dong 17 Phone: 82-2-526-5126
Seoul, Korea Email: kwko@kt.co.kr
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A SIP application using INFO message for IP premise control
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