[Serusers] Global Failover Server
Greger V. Teigre
greger at teigre.com
Sat Jul 8 09:27:27 CEST 2006
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 at hotmail.com <mailto:ritesh_jalan at hotmail.com>
> URL: http://www.net4.in
>
> ----- Original Message -----
> *From:* samuel <mailto:samu60 at gmail.com>
> *To:* G. Jacobsen <mailto:g_jacobsen at yahoo.co.uk>
> *Cc:* seruser List <mailto:serusers at 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 at yahoo.co.uk
> <mailto:g_jacobsen at 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 at lists.iptel.org
> <mailto:serusers-bounces at lists.iptel.org>[mailto:
> serusers-bounces at lists.iptel.org
> <mailto:serusers-bounces at 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 at net4.in
> <mailto:ritesh.j at 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 at hotmail.com
> <mailto:ritesh_jalan at hotmail.com>
>
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