8 Jul
2006
8 Jul
'06
10:27 a.m.
Your right, of course. Using DNS SRV for reliability has its
limitations. The idea is to combine various methods to come as close as
you can get. I assume that your statement is based on how RFC3263
specifies handling of outbound server going down mid-dialog?
g-)
Ritesh Jalan wrote:
Hi
DNS SRV is a Load Balance system, How it can be a fail over.
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
net4.in
Ritesh Jalan
Senior Engineer - Business Solution
Net4India Ltd.
D-25 Sector - 3
Noida - 201301
India
Tel: 91-120-5323500
Mobile: 91-9818616329
Fax: 91-120-5323520
MSN: ritesh_jalan(a)hotmail.com <mailto:ritesh_jalan@hotmail.com>
URL: http://www.net4.in
----- Original Message -----
*From:* samuel <mailto:samu60@gmail.com>
*To:* G. Jacobsen <mailto:g_jacobsen@yahoo.co.uk>
*Cc:* seruser List <mailto:serusers@iptel.org>
*Sent:* Friday, July 07, 2006 2:00 PM
*Subject:* Re: [Serusers] Global Failover Server
Following lines are an extract from the SIPit preliminary report
regarding supported DNS features in current implementations:
160 people from 16 countries attended SIPit 18
with *73*
different SIP implementations:
Full 3263 25
3263 (no naptr,SRV on) 13
A only 22
IP only (no DNS) 9
Which gives a percentage of 38/73 supporting SRV records, so more
or less half of the implementations supports this type of load
balancing.
This value should be used with care because implementations
include both UAs and proxies/redirect/* servers.
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...
Hope it helps,
Samuel.
2006/7/6, G.Jacobsen < g_jacobsen(a)yahoo.co.uk
<mailto:g_jacobsen@yahoo.co.uk>>:
Samuel,
Do you happen to know what percentage of UAs out there are
really "Compliant" UAs ?
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.
Can anyone supply real usage figures regarding
compliant/non-compliant UAS ?
TIA
Gerry
-----Original Message-----
*From:* serusers-bounces(a)lists.iptel.org
<mailto:serusers-bounces@lists.iptel.org>[mailto:
serusers-bounces(a)lists.iptel.org
<mailto:serusers-bounces@lists.iptel.org>]*On Behalf Of
*samuel
*Sent:* Donnerstag, 6. Juli 2006 14:52
*To:* Ritesh Jalan
*Cc:* seruser List
*Subject:* [Bulk] Re: [Serusers] Global Failover Server
Look at RFC 3623.
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.
Samuel.
2006/7/5, Ritesh Jalan <ritesh.j(a)net4.in
<mailto:ritesh.j@net4.in>>:
Hi All
Pls. guide me how can we implement failover on SIP
Server located globally, Like one server in USA
another in UK.
Ritesh Jalan
Mobile: 91-9818616329
MSN: ritesh_jalan(a)hotmail.com
<mailto:ritesh_jalan@hotmail.com>
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