asterisk users - Sep 2005 - "Registered SIP '202' ... expires 1800". Why does it expire

Hi,

When a SIP client registers on Asterisk server, why it expires after
certain amount of time?

Zeeshan Zakaria wrote:
> Hi,
> 
> When a SIP client registers on Asterisk server, why it expires after
> certain amount of time?
> 
Because it is the way SIP registrations work. For more information, find
a SIP book or read the SIP RFC 3261.

SIP phones need to re-register every once in a while to tell the server
where it can be reached. If you have a soft phone on a laptop that you
move from network to network - home, office, airport, Barnes & Noble etc
- you want to be reached on the IP address you use there. SIP
registration keeps the server up-to-date with your hectic life :-)

/Olle

---
Astricon - where you meet Asterisk friends and re-register with them
by exchanging updated business cards!
http://www.astricon.net/2005 - register today!

Because the server does not want dead or unconnected phones that might
move.

If the phone does not send a REGISTER every so often, periodically, then
the server will assume the phone is no longer available to send calls
to.

Unlike the Government, Asterisk will not send checks to dead people.

Race "the tyrant" Vanderdecken

-----Original Message-----
From: asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Zeeshan
Zakaria
Sent: Friday, September 09, 2005 10:56 AM
To: asterisk-users@lists.digium.com
Subject: [Asterisk-Users] "Registered SIP '202' ... expires
1800". Why
doesit expire

Hi,

When a SIP client registers on Asterisk server, why it expires after
certain amount of time?

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