r_mervart wrote:
> I am trying to establish whether my son, who is setting up a (very) small
> business, could possibly save some
> money using VoIP compared to a standard BT landline but still have a
> reliable service with comparable voice quality and without getting bogged
> down with technicalities. I am assuming that he will have a BT broadband
>
> All he needs, at least to start with, is an equivalent to a single BT phone
> line with basic facilities, such as answerphone and call divert, a local
> (London) number and possibly 0845 or 0870 number. Purely software solution
> dependant on a constantly running PC would not be a good idea.
> The service needs to be reliable and with voice quality comparable to a
> standard BT or NTL line without blips* or other manifestations of problems
> with data activities on the broadband connection.
> *If it could be arranged that the voice comms takes priority over any other
> broadband activity (to suspend it) without the need for human
> intervention - that could be acceptable.
>
> Could anyone suggest suitable service but also required equipment. Or
> should he get a standard telephone line for the time being?
Well, he'll need a standard PSTN line from BT before he can order ADSL
(I'm assuming that he's not in a position to install SDSL or a leased
line...), so any saving he makes will be on call costs.
Voiptalk will give him an 020 7 or 020 8 inbound number for about £3 a
month, and charge him about £0.01 a minute on outbound calls.
He'll need an ATA box of some sort (they run from about £30 to about
£70) or are sometimes integrated with ADSL routers, and a router that
supports QoS (which will allow you to give priority to voice traffic).
See
http://www.draytek.co.uk/products/vigor2500v.html
Here's the expensive part: for *good* call quality, you need packets to
be delivered regularly. The upstream channel of ADSL is 256kbps, and in
a domestic ADSL installation, that may be shared by 50 users. G.729
needs about 14kbps, so you may get less quality than you expected.
A typical "business" ADSL connection has a contention ratio of 20:1, and
you may get away with this for one call at a time. Generally, our
customers buy uncontended (1:1) ADSL connections, but they are running
more extensions than you want to.
If you'd like to give me your 'phone number by email, I can give you a
demonstration.
jd
--
John Daragon
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Lambs Lawn Cottage, Staple Fitzpaine, Taunton, TA3 5SL, UK
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