[OKCon-Programme] Fwd: SIP calls & OKCon

Mon Mar 21 11:46:55 GMT 2011

Dear Wouter,

Even though I probably won't attend the next conference call, I was able to install Blink for Mac and it perfectly works (thanks to your explanations it was very simple). For me it would be therefore fine to use it now or in the future.

Best,
Claudia

On Mar 21, 2011, at 11:02 AM, Wouter Tebbens wrote:

> Dear Daniel and all,
> 
> did you receive my message last week re. the SIP conference call system?
> 
> And were you able to install SIP clients or get a hold on a SIP phone?
> 
> If not, we can also use another conference call system, with a landline in the Netherlands, but there the SIP access is limited. This in combination with a phone service like freecall.com allows you to call in for free as well ;-)
> 
> Let me know what you prefer.
> 
> best,
> 
> Wouter
> 
> -------- Original Message --------
> Subject: [OKCon-Programme] SIP calls & OKCon
> Date: Fri, 18 Mar 2011 10:09:46 +0100
> From: Wouter Tebbens <wouter at freeknowledge.eu>
> Reply-To: OKCon Programme Committee List <okcon-programme at lists.okfn.org>
> Organization: Free Knowledge Institute
> To: okcon-programme at lists.okfn.org
> 
> Dear all,
> 
> as suggested at the last Programme Committee it would be preferred to
> use SIP for internet calls over Skype. Below follows an introductory
> explanation and some pointers.
> 
> We can use a conference room from the Free Knowledge Institute, which
> can be reached by using SIP calling to: 880 at voip.freeknowledge.eu
> The system will ask for this password: 1234.
> 
> Please test it before so you'll be sure you can reach it for the next
> meeting.
> 
> I hope it works out well for you! And be welcome at the telecom
> revolution ;-)
> 
> best,
> 
> Wouter
> 
> ===================================================================
> *Call using the internet SIP standard*
> 
> *Why not Skype?*
> Skype is a non-free piece of software that uses a secret and proprietary
> protocol for making phone calls between its users. The phone network is
> therefore owned and controlled by one company.
> 
> *Why SIP?*
> SIP (Session Initiation Protocol) is an open standard protocol for
> establish phone conversations over the internet, and can be compared to
> the SMTP protocol and is also defined by the IETF.
> 
> Thus a dynamic ecosystem of developers, users and phone companies is
> emerging that bases on this open standard protocol.
> 
> http://en.wikipedia.org/wiki/Session_Initiation_Protocol
> 
> *How do I use SIP?*
> Many developers have made available software applications that implement
> SIP. either published as Free Software or as non-free.
> 
> Several forms exist:
> A. install a client similar to skype, set up an account and call for
> free between all other SIP users, from that account provider and others
> that use SIP.
> 
> B. like A but purchase some credit from a SIP enabled phone company that
> let's you call to plan old telephone numbers.
> 
> C. install (or rent) a server with a software PBX (cf. phone central).
> Asterisk is one of the most famous Free Software applications that does
> this for you. Once you have such server installed, you can create your
> own accounts, set up conference rooms and/or gateways to the plain old
> phone network.
> 
> D. buy a hardware phone that implements the SIP protocol and add your
> personal SIP account(s) into it and use it with A, B and/or C.
> 
> See for example:
> http://en.wikipedia.org/wiki/List_of_SIP_software#SIP_clients
> Blink is a useful app: http://icanblink.com/ but you can find many others.
> 
> FreeCall is one of those companies that let's you purchase credit
> (mainly for calling mobiles) and (after buying initial credit) let you
> call for free to most landlines in the world.  http://FreeCall.com
> 
> The nice thing is to combine various forms. But maybe you want to start
> slowly ;-)
> 
> best,
> 
> -- 
> Wouter Tebbens
> --
> Free Knowledge Institute /Unlocking the knowledge society/
> http://freeknowledge.eu/
> Free Technology Academy /Online education about Free Software/
> http://ftacademy.org/
> 
> 
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------------------------------------------------------------------------------------------
Claudia Müller-Birn 
Visiting Assistant Professor
FU Berlin  |  Institute of Computer Science  |  Networked Information Systems
phone: +49 30 838 75256
mail: clmb at inf.fu-berlin.de
web: www.clmb.de