[asterisk-biz] Quote for feature: Check to see if a peer is up

[Alex Balashov]

Ah, I see.  Yes, I embrace the pragmatism of such a design decision, though I do think that a little more emphasis could be put on the fact that rollover is not based on standard T1 values.

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This message was painstakingly thumbed out on my mobile, so apologies for brevity and errors.

Alex Balashov - Principal
Evariste Systems LLC
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Suite 106
Atlanta, GA 30030
Tel: +1-678-954-0670
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Web: http://www.evaristesys.com/, http://www.alexbalashov.com

On May 23, 2012, at 5:21 PM, "Kevin P. Fleming" <kpfleming at digium.com> wrote:

> On 05/23/2012 07:09 AM, Alex Balashov wrote:
>> You mean Asterisk uses a Timer T1 value of 250 by default? Or just for OPTIONS requests?
> 
> Neither. If 'qualify' is enabled for a peer, the T1 timer for that peer is reduced to the average of its response time to the OPTIONS pings that 'qualify' generates (with a default minimum of 100ms). This behavior can be overridden by changing the minimum T1 timer value as I posted previously.
> 
> While this behavior is technically not RFC3261 compliant (and I've had discussions about it with at least one of the RFC's authors), it's quite useful in making decisions about whether a peer has become unavailable more quickly than would normally be possible. For a local peer that responds to OPTIONS requests in 100ms or less, if that peer stops responding, Asterisk will be able to make that determination in approximately 6 seconds, instead of the 32 seconds that would normally be required.
> 
> -- 
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype: kpfleming
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
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> 
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