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

[Douglas Mortensen]

Thanks for the answer Danny. Can you give an example of when we would setup peers through Method 1 & 2 as you described?

If I am using FreePBX & setup generic SIP extensions & then use Polycom phones & configure them to register with the SIP server (asterisk) with the extension/user & password, are these extensions (or maybe more correctly "peers") I setup via FreePBX actually "self-registration" or "required-registration" peers?

Thanks,
-
Doug Mortensen
Network Consultant
Impala Networks
P: 505.327.7300

From: Danny Nicholas [mailto:danny at debsinc.com]
Sent: Monday, November 14, 2011 3:26 PM
To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
Subject: Re: [asterisk-users] How do extensions "stay registered"

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> [mailto:asterisk-users-bounces at lists.digium.com]<mailto:[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<mailto:doug at impalanetworks.com>).

From: asterisk-users-bounces at lists.digium.com<mailto:asterisk-users-bounces at lists.digium.com> [mailto:asterisk-users-bounces at lists.digium.com]<mailto:[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<http://www.impalanetworks.com>
P: (505) 327-7300
F: (505) 327-7545
.

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