asterisk users - Jun 2010 - Unregister and register SIP phones by using num pad on phones?

Hello dear list.


A couple of years ago, I worked with a Alcatel IP pbx and Alcatel Sip phones,
and we had the opportunity
to unregister user  by typing *-a number and -* again, ex * 99 *, and then the
phone number/sip extension was unavailable, and
all of the calls to that extension was redirected to the receptionist.

When the user came back and wanted to register her sip account/extension, the
user typed in a similar "code" ex * 99 * and internal sip, and voila,
Extension is online again. This was very useful regarding when users changed
offices and so on, they didn't have to carry their phones, they just
unregistered and
Later on registered themselves on the other office.

Are there any similar options on Asterisk, or is this more or less HW related?
Currently testing SNOM m300,Cisco spa525, Cisco spa520, and grandstrem gxp 3000.

Med vennlig hilsen / Best regards
Abacus IT AS
- din Visma Software Partner
- your Visma Software Partner

Tor Aksel Celasun
Mobilnummer/cell phone: (+47) 900 15 103
Sentralbord/Support 4000 1850
aksel at abacus-it.no<mailto:aksel at abacus-it.no>

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Hi!
> A couple of years ago, I worked with a Alcatel IP pbx and Alcatel Sip
> phones, and we had the opportunity to unregister user by typing *-a
> number and -* again, ex * 99 *, and then the phone number/sip extension
> was unavailable
It is entirely up to you to design the Asterisk dialplan this way; many 
implementations have created such a "roving user" one way or another. 
Some more complex solutions also re-provision the phones (e.g. 
"Gemeinschaft") accordingly, while others simply make the extension 
available/unavailable.

I am sure that the Wiki at voip-info.org has some examples.

There are also phones that support "hot-desking" (the SNOMs do, for 
example), but usually I find that to be too complicated for the end user.

Philipp