[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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