[SIPForum-discussion] Registration timer

[sreekant nair]

Hi All,

Just ran a test using X-Lite. 

Registered with my proxy and the 200OK response has an expires =600.
The client then registered again after 591 seconds. So the registration binding is refreshed before it expired. 
Note: Time was calculated as difference of timestamps in Wireshark and not using any other timestamps. 

I guess the duration when a User Agent chooses to re-register or the "registration refresh interval" is implementation specific.

Thanks all
Sreekant Nair



----- Original Message ----
From: 杨伟 <shyw13 at gmail.com>
To: sreekant nair <sreekant_nair at yahoo.com>
Cc: Boris vercher <boris.vercher at ilexia.com>; shakthi_msc at yahoo.com; SIP <discussion at sipforum.org>
Sent: Wednesday, August 6, 2008 10:26:27 AM
Subject: Re: [SIPForum-discussion] Registration timer


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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