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On Fri, Jan 02, 2009 at 02:37:21PM +0000, Gordon Henderson wrote:
>
> So as I've er... volunteered to talk about asterisk tomorrow, are there
> any pressing questions people want answering? I was just thinking of
> putting something together about what it is, and how it works, and
> something about VoIP in-general, but if anyone has any specific interest,
> then drop me an email and I'll see what I can do...
>
From my reading so far, I would be very grateful if you could provide any light
on any of the following:
- What holes do I need to poke in a network firewall: going from this, what
sort of network structure would you recommend and how would you protect the
VoIP from poor security, loss of privacy / eavesdropping, spam. Going on from this
is the
whole issue of encryption.
- Voice quality (largely answered in your earlier email)
- What sort of hardware, software, providors do you like using? Follow on
questions:
- How can we determine who are good providors / bad providors? (A random
selection of vendors include: Skype, tuxphone.co.uk, sipgate.co.uk,
tesco, voipstunt, voipcheap)
- Hardware
- What sort of phones?
- Routers, firewalls, Analog Adapters?
- Software:
- for softphones, any issues
- If I buy a VoIP number from one providor, then can I keep the number and
switch providors?
Using a PBX
- Are there advantages to having your own pbx or using a centrex type service
(eg both www.gradwell.co.uk and www.tuxphone.co.uk offer a £8.50 number +
"unlimited" UK minutes to landlines).
- for PBX there is Asterisk, but there are also various flavours of this.
(Freepbx, AsteriskNow, Trixbox). Any preferred implementations (or any
implementations best avoided)
- Some websites stated that Asterisk should not be installed as(by) root. Does
this matter in Debian? (For others reading this, Debian installed very easily
and I had a working system running on my lan in about 30 minutes: I have not
tried going outside the lan as yet)
- There seem to be two protocols involved: SIP and IAX2. What do you recommend
and why?
- SIP has more hardware
- IAX is more modern, uses less bandwidth and is easier to set up thru
firewalls
I have not asked the question as to whether the PBX should link directly to PTSN as
frankly the hardware costs of that alone seems to be around £200+ mark; and hence
seems more corporate; unless there are general issues involved.
And happy new year to all
--
Henry
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