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List: sip-implementors
Subject: RE: [Sip-implementors] Definition of Call-ID
From: "Chris Boulton" <cboulton () ubiquity ! net>
Date: 2003-02-28 10:00:12
Message-ID: 45730E094814E44488F789C1CDED27AE13D994 () GBNEWP0758M ! eu ! ubiquity ! net
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<<< See comments >>>>
-----Original Message-----
From: Hemant Pandey [mailto:hemant@india.mercurykr.com]
Sent: 28 February 2003 03:31
To: sip-implementors@cs.columbia.edu
Subject: [Sip-implementors] Definition of Call-ID
Dear All,
To implement multimedia services in 3G network, I recently
started studying RFC3261 for SIP protocol. Since i am new to SIP
protocol, i have confusion about few terms used in RFC3261.
1. Call-ID
What exactly this Call-ID identifies?
<<<< The Call-ID is seen as a unique identifier for a particular call.
It is then used by the originating client to match responses
appropriately.
In its definition in RFC3261, Call-ID acts as a unique identifier to
group together a series of messages.
So what does this group means?
<<<<A Sip call consists of a series of requests/responses. Clients
(both client and server) need a mechanism to associate(group) such
requests/responses.>>>>
2. What is target refresh requests? How these requests could be
differentiated with other requests?
<<<< It is a 'keep alive' mechanism for sip. They are
differentiated by incrementing the sequence number of the new request
(CSEQ).
3. which RFC should be referred for latest SIP call flows examples?
<<<< See draft-ietf-sipping-basic-call-flows-01.txt from the
ietf sipping group. >>>>
i will be obliged if any one help to clear these points.
Regards
Hemant Pandey
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><<< See comments \
>>>><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> Hemant Pandey
[mailto:hemant@india.mercurykr.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> 28 February 2003 03:31<br>
<b><span style='font-weight:bold'>To:</span></b>
sip-implementors@cs.columbia.edu<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Sip-implementors]
Definition of Call-ID</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3
face="Times New Roman"><span \
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Dear All,<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
To implement multimedia services in 3G network, I recently started studying \
<strong><b><font face=Arial><span style='font-family:Arial'>RFC3261 \
</span></font></b></strong>for SIP protocol. Since i am new to SIP protocol, i have \
confusion about few terms used in RFC3261.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><strong><b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>1.</span></font></b></strong><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> \
Call-ID<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> What exactly this Call-ID
identifies?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'><<<<
The Call-ID is seen as a unique identifier for a particular call.<span
style='mso-spacerun:yes'> </span>It is then used by the originating
client to match responses appropriately. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> In its definition
in RFC3261, Call-ID acts as a unique identifier to <strong><b><font face=Arial><span
style='font-family:Arial'>group</span></font></b></strong> together a series of
messages.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>So what does this group \
means?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'><<<<A
Sip call consists of a series of requests/responses.<span
style='mso-spacerun:yes'> </span>Clients (both client and server) need a
mechanism to <span class=GramE>associate(</span>group) such \
requests/responses.>>>><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><strong><b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>2. \
</span></font></b></strong><font size=2 face=Arial><span \
style='font-size:10.0pt;font-family:Arial'>What is target refresh requests? How these \
requests could be differentiated with other requests?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><span \
style='mso-tab-count:1'> \
</span><<<< It is a ‘keep alive’ mechanism for sip.<span
style='mso-spacerun:yes'> </span>They are differentiated by incrementing
the sequence number of the new request (CSEQ).<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><strong><b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>3. \
</span></font></b></strong><span class=GramE><font size=2 face=Arial><span \
style='font-size:10.0pt;font-family: Arial'>which</span></font></span><font size=2 \
face=Arial><span style='font-size:10.0pt;font-family:Arial'> RFC should be referred \
for latest SIP call flows examples?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><span \
style='mso-tab-count:1'> \
</span><span class=GramE><<<< See \
draft-ietf-sipping-basic-call-flows-01.txt from the ietf sipping group.</span> \
>>>><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>i will be obliged if any one help to
clear these points.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Regards<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Hemant Pandey<o:p></o:p></span></font></p>
</div>
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