[SIPForum-discussion] how user agent knows that standby server isnow active?

[Anthony Orlando]

I agree with Aaron :).  It really depends on the implementation of the server and it's redundancy mechanism.  One server we worked with had active-active config.  If one side of the cluster went down the other node took over the VIP and there was no notice to the UAC

Another server I currently work with is handled with DNS as stated by Aaron.  

Anthony

--- On Thu, 1/14/10, Aaron Ober <aaron.ober at gmail.com> wrote:

From: Aaron Ober <aaron.ober at gmail.com>
Subject: Re: [SIPForum-discussion] how user agent knows that standby server isnow active?
To: "XIAO Xiaohong" <Xiaohong.Xiao at alcatel-sbell.com.cn>
Cc: discussion at sipforum.org
Date: Thursday, January 14, 2010, 7:32 AM

Usually this is handled by using a highly available soft switch implementation, as you have database synchronization issues (location registrar, credentials and allowed features and so on) to deal with. However, if this is no the case, then I would expect that you would be using the following two items at a minimum: 

Having the registrar (or SBC) force the UAC to register more frequently, so that the UAC's register to the new active registrar and not miss too many calls. The faster the registration, the less likley a user will notice the fail over. Usually an SBC is used to protect the registrar which can force the UAC to register frequently (like every 45 seconds or so) but only sends the registration up to the soft switch according to the registration expires value (usually 3600 seconds) returned in the 200 OK. This takes the load off the soft switch, but keeps the UAC communicating with the registrar/SBC.  

Leverage RFC-3263 on your UAC to rsolve the server address(es) and let DNS do it's intended function. Hope this helps!
Aaron 

2010/1/13 XIAO Xiaohong <Xiaohong.Xiao at alcatel-sbell.com.cn>

I think the User agent should implement a kind of heart beat communication between itself and active server, and between itself and standby server.


Option message maybe a suitable way to do this.



Any other ideas?



-----Original Message-----

From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Snehalgk

Sent: 2010年1月13日 12:59

To: discussion at sipforum.org

Subject: [SIPForum-discussion] how user agent knows that standby server isnow active?



Hi all,



If active softswitch server fails & standby server will take all functions of active server then how user agent knows that standby server is now active?

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