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: [email protected] [mailto:[email protected]] 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: [email protected] [mailto:[email protected]] 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 = [email protected]). From: [email protected] [mailto:[email protected]] On Behalf Of Douglas Mortensen Sent: Monday, November 14, 2011 3:52 PM To: '[email protected]' 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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