[PreViking-devel] previous message and open source cell phone system

[Abul K. <abu...@ya...>]

Hi all,

Please ignore my previous message about Linejack POTS application.

I found out that GSM 900 cellular phone is the cheapest phone system to
deploy compared to any Computer telephony based system.

Previking with Linejack or NMS cards are still good for calling card
gateways for International long distance. I am interested in this
application. Could anyone tell me if there are many previking based
systems deployed worldwide for call terminations - so that if I wanted to
use a previking based gateway, I could have transactions with these
termination gateway owners. Is that how Telesave works, or are you guys
using other carriers to terminate your calls? For telesave guys, I have
access to a very good termination location for a large number of East
Londoners from Bangladesh who mostly call a place there called Sylhet. I
would like to put a previking based termination gateway there starting
from a single T1 to multiple T1's, if you guys have a need for it.

It seems to me while everyone is busy writing open source codes for
gateways (Previking), IVR's (Bayonne) and softswitches (Vovida's VOCAL)
the Telecom world has already created a new business model based on Cell
Phones. Today there are close to 800 million cell phones world-wide and
they are increasing everyday specially in emerging and developing
countries where there are no extensive copper last mile network deployed.
The projection is that by 2006 there will be close to 2 billion cell phone
users.

The reason I bring this up is that all the open source codes written so
far can be used in this new cell phone world as well. There are two
competing standards in mobile telephony. The Qualcomm based CDMA (CDMA2000
for 3G) and GSM (W-CDMA for 3G). Although CDMA seems to be a better
technology (since GSM also will adopt this in the future), GSM for now is
the winner and will remain so for voice services. People predict that most
of the mobile internet users will prefer the CDMA2000 technology. The
reason for 70% market-share of GSM (compared to 13% for CDMA) is that it
seems to be a more open standard than the partly proprietary CDMA, and due
to that there are more vendors offering cheaper equipments.

Because of economies of scale (600 million) the GSM 900/1800 handset will
be the cheapest most powerful telephony and radio device ever built. To
leverage this device as well the GSM radio interfaces, the only code base
we need is a combination of softswitch for MSC and some other parts like
HLR, VLR, Vocoders, BSC & BTS software etc. VLR and HLR are basically high
speed real time databases.

I know that resources are limited for the open source teams in terms of
coders but I just wanted to find out if anyone has similar thoughts and if
there could be a future initiative for an open source cellular phone
system based on the GSM/GPRS/EDGE/W-CDMA technology which is currently the
winning camp.

Hopefully this was not a total waste of time for list users.

Abul Kalam

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