from
http://www.voip-info.org/wiki/view/Asterisk+sip+qualify
> qualify=xxx|no|yes
>where XXX is the number of milliseconds used. If yes the default timeout is used, 2 seconds.
>If you turn on qualify in the configuration of a SIP device in sip.conf, Asterisk will send a SIP OPTIONS command regularly to check that the device
>is still online. If the device does not answer within the configured (or default) period (in ms) Asterisk considers the device off-line for future calls.
What happens if you use nat=yes is that Asterisk will consider the IP for communicating with the SIP user agent (UA) as the IP from where the SIP invite comes from instead of taking the one included in the SDP message. Hence if you are using phones inside a LAN this 2 addresses will be the same, but if your SIP UA is outside they will not.
Having all your phones set with nat=yes and qualify =yes, will not affect the behaviour of your phones if your network is not really full, but will be a bad and dirty way to do it :)
Alyed
Return-Path: <[EMAIL PROTECTED]> Tue Aug 01 08:35:05 2006
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As far as i know qualify=yes will increase you network traffic, this will make asterisk to communicate with all sip friends every X seconds, not sure the default value.
On 8/1/06,
BerkHolz, Steven <[EMAIL PROTECTED]> wrote:
Are there any problems with always having nat=yes and qualify=yes?We just opened up our server to be accessible to SIP from the internet. (used to require VPN)I had to set the SIP setting for my test softphone to nat=yes and qualify=yes.This makes sense.Some of these phone will never leave our building.Some of these phone will come and go. (laptops)Is the any negatives to just have all phones set to nat=yes and qualify=yes?If not, why is it not the default?
Thank You,
Steven BerkHolz
- MCSA - MCSE -
Manager of Information Systems
TESCO Group Companies
Fax. 248-836-5101
www.TESCOGroup.comBoard member of
www.glimasoutheast.org
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