[asterisk-users] How do extensions "stay registered"

[Carlos Alvarez]

I think the registration part was answered.  The de-registration part is
different.  If the phone is gracefully taken off line it specifically
de-registers.  If it just can't be reached because it powers off or the
router closes NAT, or whatever, then Asterisk won't know this until it
times out.


On Mon, Nov 14, 2011 at 3:19 PM, eherr <email.eherr9633 at gmail.com> wrote:

> I think the question is more along the lines of how does asterisk know
> immediately when a sip phone becomes on line and when you unplug the phone
> from the network, how does asterisk essentially know immediately that it
> status is “UNKNOWN”****
>
> ** **
>
> If I am not mistaken.****
>
> ** **
>
> --E****
>
> ** **
>
> *From:* asterisk-users-bounces at lists.digium.com [mailto:
> asterisk-users-bounces at lists.digium.com] *On Behalf Of *Danny Nicholas
> *Sent:* Monday, November 14, 2011 5:01 PM
> *To:* 'Asterisk Users Mailing List - Non-Commercial Discussion'
> *Subject:* Re: [asterisk-users] How do extensions "stay registered"****
>
> ** **
>
> “Extensions” do not register – peers do.  A peer can register itself or be
> registered by Asterisk.  In most cases the “extension” is equivalent to the
> “peer” (301 = 301) but it can be quite different (301 = sipuser1) or (301 =
> doug at impalanetworks.com).****
>
> ** **
>
> *From:* asterisk-users-bounces at lists.digium.com [mailto:
> asterisk-users-bounces at lists.digium.com] *On Behalf Of *Douglas Mortensen
> *Sent:* Monday, November 14, 2011 3:52 PM
> *To:* 'asterisk-users at lists.digium.com'
> *Subject:* [asterisk-users] How do extensions "stay registered"****
>
> ** **
>
> I know this is probably a very basic question for many on this list. But
> in troubleshooting an issue, I wanted to take a step back & ask the
> question. In Asterisk (or maybe all SIP), how do extensions stay registered
> with the SIP server?****
>
> ** **
>
> Do the extensions simply register repeatedly as a means of telling
> asterisk “I’m still here”, or are there actual keepalive packets that are
> transmitted to actually keep a TCP session alive? My guess is the former.*
> ***
>
> ** **
>
> But am I oversimplifying it? Is there more to the process?****
>
> ** **
>
> Thanks,****
>
> -****
>
> Doug Mortensen****
>
> Network Consultant****
>
> *Impala Networks Inc*
>
> CCNA, MCSA, Security+, A+****
>
> Linux+, Network+, Server+****
>
> .****
>
> www.impalanetworks.com****
>
> P: (505) 327-7300****
>
> F: (505) 327-7545****
>
> .****
>
> ** **
>
> --
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-- 
Carlos Alvarez
TelEvolve
602-889-3003
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