[asterisk-users] Digital Phones

[Jason Fuermann]

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: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
>> bounces at lists.digium.com] 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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