I've used these gateways and never experienced any of these problems. I
could imagine me missing the popping noise but I do know that MWI did
work just fine.
Steve Totaro wrote:
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:asterisk-users-
[EMAIL PROTECTED] On Behalf Of Stephen Bosch
Sent: Wednesday, May 02, 2007 1:36 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] Digital Phones
Salvatore Giudice wrote:
Nortel digital Meridian phones are like $400/each. At least that was
the
price of the phones at a hotel I did a job for recently.
Still?
(Is Nortel even making these phones anymore? I thought they spun off
their telephone set division -- anybody heard of Aastra? ;) )
When you go to SIP, you may save on the capital costs for the
phones,
but
other costs will increase. These are related to:
1.) increased support requirements for supporting VoIP
2.) additional licensing may be required from your vendor to support
SIP
or
IP media
3.) increased costs associated with mitigating potential damages
since
your
voice services are now subject to the same outages as your network
4.) increased training costs for staff to become proficient in VoIP
5.) increased costs associated with monitoring QoS
6.) increased costs associated with reconfiguring your network for
VoIP
and
QoS - many times new switches may have to be purchased in addition
to
SBC's
etc
7.) additional costs associated with rewiring physical space to
accommodate
additional Ethernet ports required for phones
Yes, 7 times.
Sometimes, if you already have digital - it may not be worth
switching
to
SIP even if you save a ton on the handsets. Whenever we switch over
a
hotel
to VoIP, we always run into these extra 'hidden' costs.
If you want to do digital with asterisk, I think you'll need a T1/E1
multiplexer that supports digital phones.
Is this anything like a channel bank, only for digital phones?
Can you suggest any examples?
-Stephen-
Citel makes SIP to Digital gateways. I have had poor experience with
them and doubt I would try it again without seeing many improvements
listed in their firmware releases.
Just to clarify, I had loud bursts of static when first picking up or
originating a call, phones resetting for no reason, regular interval
popping sounds. Citel fixed the popping sound by replacing one of the
gateways but the other issues were never fixed.
Also, the phones did not act the way I would have liked. When dialing,
only a beep was heard, not actual DTMF and stutter dialtone MWI could
not be disabled even though the phone I used had a MWI light and LCD
display showed messages.
Thanks,
Steve Totaro
http://www.asteriskhelpdesk.com
KB3OPB
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