[Gllug] SwitchedOnUK

[James Roberts]

Jason Clifford wrote:
> On Thu, 16 Nov 2006, t.clarke wrote:
> 
>> I would love to know exactly what arethe benefits of IP-switched plain
>> telephone calls over the existing TDM system.  What about latency and
>> 'jitter' ??
> 
> In practice IP telehony is very reliable these days. You'd only get 
> latency issues if you have a poor IP connection. BT have plenty of 
> bandwidth and a good network to push this over.
> 
> Jason 

Hah! You *have* to be kidding! :)

Given a 2Mbps SDSL 10:1 inter-office line, and a good backbone provider, 
we cannot reliably provide 30 users with connectivity interoffice 
(average use 10 lines at a time). This is *supposed* to support 50 users 
at the two office with 2Mbps out at teach end.

We have other clients managing using it for interoffice exclusively with 
ISDN out to pots and that works (with mobiles as a backup).

Our client has:

- latency problems
- regularly dreadful call quality
- regular dropped calls
- and NO reduction in costs if you take into account the work that has 
been lost.

We have told out client to go back to pots. Alternative: leased line for 
VoIP. Economies? Hah!!

This system is supplied by a major VoIP supplier, who say 'none of our 
other clients suffer from this'. But I have talked with some of the 
'other clients' and they are *not* in accord with this view.

VoIP works great at the single-user level and as a cheap backup for a 
low cost calling line (I use 18886/18185). Skype is useful for 
emergencies and out-'n-about.

But VoIP as a replacement for backbone voice connectivity? Not ready for 
prime-time IMHO. Don't care *how* many resellers there are...

Gawd 'elp us if they are moving the whole backbone to IP...

JR
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