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

[Douglas Mortensen]

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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