[Asterisk-Users] "Registered SIP '202' ... expires 1800". Why does it expire

[Olle E. Johansson]

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!