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uk.telecom.voip (UK VOIP) (uk.telecom.voip) Discussion of topics relevant to packet based voice technologies including Voice over IP (VoIP), Fax over IP (FoIP), Voice over Frame Relay (VoFR), Voice over Broadband (VoB) and Voice on the Net (VoN) as well as service providers, hardware and software for use with these technologies. Advertising is not allowed.

IP Phones and sidetone



 
 
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  #1  
Old October 14th 05, 10:26 AM posted to uk.telecom.voip
Telephoneman
external usenet poster
 
Posts: 23
Default IP Phones and sidetone

I recently bought a couple of cheap IP phones from ebay. They are made by
different (Chinese) manufacturers but apparently both use the PA1688
chipset. The issue is the have no sidetone, i.e. if you blow in the
mouthpiece you don't hear anything in the receiver. Is this common with IP
phones? POTS telephones have had sidetone for around a hundred years so it's
not like it's a new requirement for the manufacturers. What's the situation
with other (cheap) phones like the Budgetone?

TIA

Telephoneman



  #2  
Old October 15th 05, 12:18 AM posted to uk.telecom.voip
Brian
external usenet poster
 
Posts: 308
Default IP Phones and sidetone

On 2005-10-14, Telephoneman wrote:

I recently bought a couple of cheap IP phones from ebay. They are made by
different (Chinese) manufacturers but apparently both use the PA1688
chipset. The issue is the have no sidetone, i.e. if you blow in the
mouthpiece you don't hear anything in the receiver. Is this common with IP
phones? POTS telephones have had sidetone for around a hundred years so it's
not like it's a new requirement for the manufacturers. What's the situation
with other (cheap) phones like the Budgetone?


Lack of sidetone with cheaper VOIP phones would appear not to be
uncommon. Providing it could result in echo. Adding the necessary
electronic bits to produce it adds to the cost of production of the
phone. I suppose a manufacturer balances utility against expense. I
have seen remarks which indicate that the Budgetone does not generate
sidetone.

Brian.
  #3  
Old October 16th 05, 09:21 AM posted to uk.telecom.voip
Richard Anderton
external usenet poster
 
Posts: 21
Default IP Phones and sidetone

In message , Brian
writes
On 2005-10-14, Telephoneman wrote:

I recently bought a couple of cheap IP phones from ebay. They are made by
different (Chinese) manufacturers but apparently both use the PA1688
chipset. The issue is the have no sidetone, i.e. if you blow in the
mouthpiece you don't hear anything in the receiver. Is this common with IP
phones? POTS telephones have had sidetone for around a hundred years so it's
not like it's a new requirement for the manufacturers. What's the situation
with other (cheap) phones like the Budgetone?


Lack of sidetone with cheaper VOIP phones would appear not to be
uncommon. Providing it could result in echo. Adding the necessary
electronic bits to produce it adds to the cost of production of the
phone. I suppose a manufacturer balances utility against expense. I
have seen remarks which indicate that the Budgetone does not generate
sidetone.

Sidetone on phones is there to stop you shouting down the phone. It
provides a combined psychological and physical effect in that the right
level of sidetone will make you speak at an appropriate level. On a
conventional phone it always used to be done by marginally unbalancing
the line transformer. I have a couple of cheap SIP phones and they
provide sidetone of a sort by having an acoustic channel between the
microphone and the earpiece. This channel is heavily baffled to let the
right amount of signal through and not cause any feedback problems. I
don't find myself shouting so I guess it works!

Incidentally mobiles tend not to have sidetone which is why people shout
so much on them to everyone else's annoyance!
--
Richard Anderton
  #4  
Old October 16th 05, 11:55 AM posted to uk.telecom.voip
Peter Gradwell
external usenet poster
 
Posts: 128
Default IP Phones and sidetone

Telephoneman wrote:
I recently bought a couple of cheap IP phones from ebay. They are made by
different (Chinese) manufacturers but apparently both use the PA1688
chipset. The issue is the have no sidetone, i.e. if you blow in the
mouthpiece you don't hear anything in the receiver. Is this common with IP
phones? POTS telephones have had sidetone for around a hundred years so it's
not like it's a new requirement for the manufacturers. What's the situation
with other (cheap) phones like the Budgetone?


the sipura + snom phones have it.

cheers
peter

--
peter gradwell. gradwell dot com Ltd. http://www.gradwell.com/
-- engineering & hosting services for email, web and voip --
-- http://www.peter.me.uk/ -- http://www.voip.org.uk/ --
  #5  
Old October 16th 05, 04:38 PM posted to uk.telecom.voip
Ivor Jones
external usenet poster
 
Posts: 3,969
Default IP Phones and sidetone



"Richard Anderton" wrote in
message

[snip]

Incidentally mobiles tend not to have sidetone which is
why people shout so much on them to everyone else's
annoyance!


My Nokia 6310i's have sidetone. Not very loud compared to a landline, but
it's definitely there.

Ivor


  #6  
Old October 16th 05, 08:05 PM posted to uk.telecom.voip
Ian
external usenet poster
 
Posts: 289
Default IP Phones and sidetone


"Telephoneman" wrote in message
...
I recently bought a couple of cheap IP phones from ebay. They are made by
different (Chinese) manufacturers but apparently both use the PA1688
chipset. The issue is the have no sidetone, i.e. if you blow in the
mouthpiece you don't hear anything in the receiver. Is this common with IP
phones? POTS telephones have had sidetone for around a hundred years so

it's
not like it's a new requirement for the manufacturers. What's the

situation
with other (cheap) phones like the Budgetone?


Mitels sets have it once the call is connected, AFAIR so does the Budgetone
once the call is connected as well.
Ian


  #7  
Old October 19th 05, 04:10 PM posted to uk.telecom.voip
Telephoneman
external usenet poster
 
Posts: 23
Default IP Phones and sidetone


"Richard Anderton" wrote in message
SNIP

.. I have a couple of cheap SIP phones and they
provide sidetone of a sort by having an acoustic channel between the
microphone and the earpiece. This channel is heavily baffled to let the
right amount of signal through and not cause any feedback problems. I
don't find myself shouting so I guess it works!


Are you able to say what Make/Model they are? Mine have zero sidetone and
it's most disconcerting!

Liam


  #8  
Old October 20th 05, 12:05 AM posted to uk.telecom.voip
Richard Anderton
external usenet poster
 
Posts: 21
Default IP Phones and sidetone

In message , Telephoneman
writes

"Richard Anderton" wrote in message
SNIP

. I have a couple of cheap SIP phones and they
provide sidetone of a sort by having an acoustic channel between the
microphone and the earpiece. This channel is heavily baffled to let the
right amount of signal through and not cause any feedback problems. I
don't find myself shouting so I guess it works!


Are you able to say what Make/Model they are? Mine have zero sidetone and
it's most disconcerting!

Liam


They are Grandstream models.
--
Richard Anderton
 




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