<snip>
On Jan 23, 2008 9:10 PM, Fred <[EMAIL PROTECTED]> wrote:
> At 20:38 23/01/2008 +0100, Jonathan GF wrote:
> >The bad news is that big telco's knoww the Achilles' heel of VoIP is
> >energy and signalling (, SS7 is expensive) with traditional operatosr, so
> >they put efforts in advertise this to big customers, and meanwhile they
> >charge high costs for SS7.
>
> I'm not a telco guru, so why is the lack of SS7 an issue?
When you are in VoIP and need to call or to be called from landline or cell
numbers someone have to take that call from typical operators and put it
into voip networks and viceversa.
Normally companies have ranges or numbers assigned, ITSP's can also. When a
customer of one them wants to call a customer of other, both telcos have to
signal the comunication (always there's the need to signal de comunication).
This signaling out of voip is SS7. Both telcos charge each other for the use
of networks and signaling. After that the customers, will be charged (at
least the caller customer).
Small companies, i.e. VoIP ITSP's, when have to signal between voip and
landlines, suffer big charges from big telcos. This is also a manner to
state who is the predominant force.
When signaling is between voip providers the DNS is a good help (SRV
records). Also good (quick and reliable) comunications is important, reason
because ITSP's tried to have presence in the Neutral Points, aka IXP's (see
https://www.euro-ix.net/member/m/ixp/list to get an idea of what is a
Neutral Point). In the Spanish case we use to peer traffic into our two
IXP's (IntereXchange Points) covering almost all national territory and when
going out, peering mainly with London (LINX), Amsterdam (AMS-IX) and
Frankfurt (DCE-IX).
If you are interested it's important to query the web i pasted before you as
you might be interested in have presence in any of the IXP's working in
order to communicate to certain parts of the world. Any milisecond you can
gain might be less problems you have (echo, jitter, latency.....)
;)
>
>
> > From the business point of view, and in terms of AstLinux, i would like
> > to put in service AstLinux in business grade installations sometime in
> > the future.
>
> I'm also thinking of this, hence my looking at compact solutions like
> AstLinux. I thought that a compact, easy to use Asterisk would be a good
> solution for one-man offices like a doctor's office for whom it doesn't
> make sense to hire a secretary, but still needs to handle incoming calls.
> I
> was even thinking of giving out short MD5 hashes when someone makes a
> appointment through the web or Asterisk, and have the office's ring-bell
> come with a keypad so that patients must type the unique MD5 hash number
> they got -> the door opens to let them in, and the patient's profile pops
> up on the doctor's PC screen :-)
>
> Too bad I suck at maths. I would have loved learning electronics.
The idea is common... at the basics Asterisk can signal "things" so can be
used to trigger many situations.... :p
>
>
>
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