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

[Danny Nicholas]

Just trying to offer a little enlightenment - There are basically two
methods of sip phone (peer/extension) registration.  Method 1 is
"self-registration" where Asterisk does not know or care about the phone
until it asks to register.  Method 2 is "required-registration" where
Asterisk expects the phone to be there pretty much 24/7 and will attempt to
register the phone and verify that it is still there at whatever frequency
is specified.  I personally record method 1 phones in users.conf and method
2 phones in sip.conf.

 

From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of eherr
Sent: Monday, November 14, 2011 4:19 PM
To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
Subject: Re: [asterisk-users] How do extensions "stay registered"

 

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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