<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2900.2912" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>Hi</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>DNS SRV is a Load Balance system, How it can be a
fail over.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Only for call initialisation a UAC will search for
DNS SRV records, but after the the call starts, if First server (From which call
is beaing initiated) goes down then thebye message will not go to second server
</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2> </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>net4.in<BR>Ritesh Jalan <BR>Senior Engineer - Business Solution
<BR>Net4India Ltd. <BR>D-25 Sector - 3 <BR>Noida - 201301 <BR>India <BR>Tel:
91-120-5323500 <BR>Mobile: 91-9818616329 <BR>Fax: 91-120-5323520 <BR>MSN: <A
href="mailto:ritesh_jalan@hotmail.com">ritesh_jalan@hotmail.com</A> <BR>URL: <A
href="http://www.net4.in">http://www.net4.in</A> <BR></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=samu60@gmail.com href="mailto:samu60@gmail.com">samuel</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=g_jacobsen@yahoo.co.uk
href="mailto:g_jacobsen@yahoo.co.uk">G. Jacobsen</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=serusers@iptel.org
href="mailto:serusers@iptel.org">seruser List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, July 07, 2006 2:00 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Serusers] Global Failover
Server</DIV>
<DIV><BR></DIV>Following lines are an extract from the SIPit preliminary
report regarding supported DNS features in current
implementations:<BR><BR>>160 people from 16 countries attended SIPit 18
with <STRONG>73</STRONG> different SIP implementations: <BR><BR>>Full 3263
25<BR>>3263
(no naptr,SRV on) 13<BR>>A only
22<BR>>IP
only (no DNS)
9<BR><BR>Which gives a percentage of 38/73
supporting SRV records, so more or less half of the implementations supports
this type of load balancing. <BR><BR>This value should be used with care
because implementations include both UAs and proxies/redirect/* servers.<BR>I
can also say that a higher percentage of desktop SIP phones supports DNS SRVs,
but since it's just my impression from the ones I have touched I can not
assure nor give a percentage... <BR><BR>Hope it
helps,<BR><BR>Samuel.<BR><BR><BR><BR>
<DIV><SPAN class=gmail_quote>2006/7/6, G.Jacobsen <<A
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:g_jacobsen@yahoo.co.uk" target=_blank> g_jacobsen@yahoo.co.uk
</A>>:</SPAN>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #cccccc 1px solid">
<DIV>
<DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2>Samuel,</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV><SPAN>Do you happen to know what percentage of UAs out there are really
</SPAN>"Compliant" UAs <SPAN> ?</SPAN></DIV>
<DIV> </DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2>My impression so far
regarding SRV DNS records is that they are theoretically a nice feature but
unfortunately almost useless since one needs to cater for those
non-compliant UAs anyway. I would love to be convinced of the contrary.
</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2>Can anyone supply real
usage figures regarding compliant/non-compliant UAS
?</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff size=2>TIA</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV><SPAN><FONT face=Arial color=#0000ff
size=2>Gerry</FONT></SPAN></DIV></DIV>
<DIV><SPAN>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<BLOCKQUOTE>
<DIV dir=ltr align=left><FONT face=Tahoma size=2>-----Original
Message-----<BR><B>From:</B> <A
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:serusers-bounces@lists.iptel.org"
target=_blank>serusers-bounces@lists.iptel.org </A>[mailto:<A
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:serusers-bounces@lists.iptel.org" target=_blank>
serusers-bounces@lists.iptel.org</A>]<B>On Behalf Of
</B>samuel<BR><B>Sent:</B> Donnerstag, 6. Juli 2006 14:52 <BR><B>To:</B>
Ritesh Jalan<BR><B>Cc:</B> seruser List<BR><B>Subject:</B> [Bulk] Re:
[Serusers] Global Failover Server <BR><BR></FONT></DIV><BR>Look at RFC
3623.<BR>Cofigure two SRV entries in
your DNS, one pointing to the UAS SERver and another to the UK server.
"Compliant" UAs will try to contact the other proxy upon failure of their
current one. <BR><BR>Samuel.<BR><BR>
<DIV><SPAN class=gmail_quote>2006/7/5, Ritesh Jalan <<A
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:ritesh.j@net4.in"
target=_blank>ritesh.j@net4.in</A>>:</SPAN>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #cccccc 1px solid">
<DIV>
<DIV bgcolor="#ffffff">
<DIV><FONT face=Arial size=2>Hi All</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Pls. guide me how can we implement failover
on SIP Server located globally, Like one server in USA another in UK.
</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Ritesh Jalan <BR>Mobile: 91-9818616329
<BR>MSN: <A onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:ritesh_jalan@hotmail.com"
target=_blank>ritesh_jalan@hotmail.com</A>
<BR></FONT></DIV></DIV></DIV><BR>_______________________________________________<BR>Serusers
mailing list<BR><A
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:Serusers@lists.iptel.org"
target=_blank>Serusers@lists.iptel.org</A><BR><A
onclick="return top.js.OpenExtLink(window,event,this)"
href="http://lists.iptel.org/mailman/listinfo/serusers"
target=_blank>http://lists.iptel.org/mailman/listinfo/serusers</A><BR><BR><BR></BLOCKQUOTE></DIV><BR></BLOCKQUOTE></SPAN></DIV></DIV><BR>_______________________________________________<BR>Serusers
mailing list<BR><A onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:Serusers@lists.iptel.org"
target=_blank>Serusers@lists.iptel.org</A><BR><A
onclick="return top.js.OpenExtLink(window,event,this)"
href="http://lists.iptel.org/mailman/listinfo/serusers"
target=_blank>http://lists.iptel.org/mailman/listinfo/serusers</A><BR><BR><BR></BLOCKQUOTE></DIV><BR>
<P>
<HR>
<P></P>_______________________________________________<BR>Serusers mailing
list<BR>Serusers@lists.iptel.org<BR>http://lists.iptel.org/mailman/listinfo/serusers<BR></BLOCKQUOTE></BODY></HTML>