[SIPForum-discussion] Expire field in the SIP Registration.

[Robert Sparks]

Doing this violates the specification.

There is no way to establish an "infinite" registration using the  
REGISTER method.

That's on purpose - its one of the fundamental architectural  
principles SIP is built on.
Registration state is "soft" - it always expires - the network will  
fail to a safe state if the
client interested in that registration is not around to refresh it.

RjS


On Jul 5, 2007, at 1:14 PM, Srinivasa Kumaran wrote:

> Amit,
>
> If you want to support infinity in expires, you can ignore the the  
> values in the expire header and program/provision the Registrar/ 
> ApplicationServer to keep the registration forever without any  
> expiration/timeout.
>
> -Kumaran
> Chief IMS Network Architect,
> Alcatel-Lucent.
>
> Date: Thu, 5 Jul 2007 10:42:29 -0700
> From: sreekant_nair at yahoo.com
> To: amit.v at pyronetworks.com; discussion at sipforum.org
> Subject: Re: [SIPForum-discussion] Expire field in the SIP  
> Registration.
>
> The Expires field is used to indicate the duration of the binding  
> of the Contact. Not sure if Infinity would be supported.
>
> However, As Per RFC3261, I think you can probably set it to a max  
> value which is supposed to be 2**32 -1. (practically equivalent to  
> 136 years)
> This is what the RFC states.
>
> expires: The "expires" parameter indicates how long the UA would
>            like the binding to be valid.  The value is a number
>            indicating seconds.  If this
>  parameter is not provided, the
>            value of the Expires header field is used instead.
>            Implementations MAY treat values larger than 2**32-1
>            (4294967295 seconds or 136 years) as equivalent to 2**32-1.
>            Malformed values SHOULD be treated as equivalent to 3600.
>
> Hope this helps.
>
> Regards
> Sreekant Nair
> ----- Original Message ----
> From: amit <amit.v at pyronetworks.com>
> To: discussion at sipforum.org
> Sent: Thursday, July 5, 2007 7:47:03 AM
> Subject: [SIPForum-discussion] Expire field in the SIP Registration.
>
>
>
>
> hello,
>
> There is a field Expire field in the SIP Registration....
> what i m do for infinite  Registration....
>
>
> thanks & regards
>
> amit
>
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