Re: Solos PCI

Olaf wrote:


> ISDN is not very good for internet, but for 'normal' voice it is
> excellent. 2 (working!) simultaneous calls, without having to worry
> about bandwidth like with VoIP.

Of course if one has a PRI which is a T1 and dedicates it to VOIP it's as 
good as it gets since you are using a carrier grade connection. In the US, 
ISDN never replaced POTS like it should have and people mistakenly compare 
VOIP to POTS whereas it should be compared to ISDN voice especially if you 
use g.711 as a minimum quality codec. VOIP using g.711 would not quite fit 
in a 64K B channel using data as there is a bit of overhead bringing it to 
80kbs. My Bandwidth meter on my Raq shows 10 up and down steadily in KBs 
during conversations. You could only fit one g.711 or g.722 conversation via 
VOIP using both B channels only but nothing else could use either B channel. 
Yeah, ISDN voice is great but for data it's puny with a BRI and only two B 
channels. 

Here it is really ISDN to the CO but then converted via a narrow band SLIC 
to analog and then that is carried via twisted copper to and into the 
premises. I use what is called a dry loop with no POTS on it and only ADSL. 
My connection can rival carrier grade most of the time but sometimes the 
latency and jitter go up momentarily. 

I've been using a Snom M9R since October and while not perfect with every 
feature I want, namely that dial plan concatenation does not yet work and it 
would be nice to have the RSS prompt not on the screen if none is set up. 
The actual call quality has been very nice and I love the form factor. The 
original M9 got bad reviews, the firmware has improved greatly since then 
and the new R model has more memory and will support a repeater. There 
aren't too many options when it comes to DECT IP phones that support more 
than six accounts and support g.722. 

Like everything else, when I got into VOIP I went a bit (ok, a lot) above 
and beyond what's needed (it turned into yet another hobby) and now I wound 
up with several carriers and many DIDs. Not what the average household 
needs. With a single carrier and unlimited channels, a household could use 
all handsets simultaneously one ONE phone number holding separate 
conversations on each handset. Probably why residential plans are different 
than business plans. If they only had this when I was a young man in a 
household with five sisters, I could have gotten more phone calls.
-- 
Dave Studeman
http://www.raqcop.com 



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