[SIPForum-discussion] Registration timer

[杨伟]

In my mind, the REGISTER message with use the Expire Header to indicate the
time of registration.

So what is the usage of Registration Timer? A REGISTER message will both
include Expire and Registration Timer Header?


2008/8/6, sreekant nair <sreekant_nair at yahoo.com>:
>
>  Very Interesting.
>
> Is "registration timer /2" specified in any RFC? or just an industry
> accepted practice? I could not find any reference in RFC 3261.
>
> Thanks in advance
>
> Regards
> Sreekant
>
> ----- Original Message ----
> From: Boris vercher <boris.vercher at ilexia.com>
> To: shakthi_msc at yahoo.com; SIP <discussion at sipforum.org>
> Sent: Tuesday, August 5, 2008 11:52:28 AM
> Subject: Re: [SIPForum-discussion] Registration timer
>
>  You have to re register at «  registration timer  / 2 » even if a sip
> registrar have to support  " registration timer  " + 10s, before clearing
> resgistration, if no register keep alive occur.
>
>
>
> So re registration occurs before " registration timers expires ". Otherwise
> you can be unregistered during 1 or 2s ( for example )
>
>
>
> When you reregister the timer is reset to the new value.
>
>
>
> However when an UA send a register with " registration timer  ", the value
> that will be used, will be the timer " registration expires " sent back by
> registrar. And not the original one sent by UA.
>
>
>
> Boris
>
>
>
> *From:* discussion-bounces at sipforum.org [mailto:
> discussion-bounces at sipforum.org] *On Behalf Of *Shakthi
> *Sent:* mardi 5 août 2008 14:35
> *To:* SIP
> *Subject:* [SIPForum-discussion] Registration timer
>
>
>
> During the SIP registration, an re-registration will occur only when the
> registration timer expires. My question is, *"Will the 'expired timer'
> from the cache is cleared for every cycle before the re-registration
> occurs?"*
>
>
>
>
>
>
>
> Thanks in Advance
>
>
>
>   -Shakthi
>
>
>
>
>
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