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

[Tomasz Zieleniewski]

Hi,

SIP uses DNS procedures in order to resolv the next hop address, in that
case SIP Proxy address.
Those procedures are decribed in RCF 3263. Generally the input is SIP URI
address and output
is a set of addresses each composed of transport indicator, IP and port. UAC
should try each address
until a server is contacted

Kind regards,
- Tomasz Zieleniewski
------------------------------
ICT Backyard - http://ictbackyard.com


2010/1/14 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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