>Peter Svensson wrote:
>
>>On Tue, 22 Mar 2005, McQuiggan, Mark xt46480 wrote:
>>
>>
>>
>>>I am using a SIP softphone (X-lite, SIPPS or Firefly) connected to an
>>>Asterisk v 1.0.3 PBX. The PBX is also connected via a ISDN-PRI crossover
>>>cable to a Avaya Definity Generic 3 PBX via a TE405P card. All outside of
>
>>On Tue, 22 Mar 2005, McQuiggan, Mark xt46480 wrote:
>>
>>
>>
>>>I am using a SIP softphone (X-lite, SIPPS or Firefly) connected to an
>>>Asterisk v 1.0.3 PBX. The PBX is also connected via a ISDN-PRI crossover
>>>cable to a Avaya Definity Generic 3 PBX via a TE405P card. All outside of
>>>the office calls go through the Definity. Here's the
issue:
>>>
>>>Calls to internal SIP extensions, Definity extensions, other offices within
>>>our private network (through the Definity), and cell phones are great. When
>>>I call outside of the office to POTS lines (like my home), there is a most
>>>noticeable echo of my voice. The party on the line hears no echo. Any
>>>efforts on the configuring the SIP softphones, and within zapata.conf, have
>>>been for naught.
>>>
>>>Is this problem common for ISDN-PRI connections?
>>>
>>>
>>
>>It is a problem you will see when calling an analogue subscriber over a
>>link with a long latency (such as VoIP). The echo will most probably be
>>generated by a 2- to 4-wire hybrid at the far end. In a pure amalogue/tdm
>>path you would perceive the reflected energy as a plesent sidetone. As
>>soon as the latency increases to 50-100ms the refelcted energy will be
>>perceived as an echo instead.
>>
>>The options available to you are to live with the echo of your own voice
>>or to insert an echo canceller at the pstn interface. Asterisk includes an
>>echo canceller that may or may not be good enough. It seems to like some
>>pstn interfaces and not others. If the Asterisk echo canceller is not
>>enough you may consider an expensive inline echo canceller.
>>
>>
>
>The definity has echo cancellation. Try turning that on.
>
>-SteveK
>>>
>>>Calls to internal SIP extensions, Definity extensions, other offices within
>>>our private network (through the Definity), and cell phones are great. When
>>>I call outside of the office to POTS lines (like my home), there is a most
>>>noticeable echo of my voice. The party on the line hears no echo. Any
>>>efforts on the configuring the SIP softphones, and within zapata.conf, have
>>>been for naught.
>>>
>>>Is this problem common for ISDN-PRI connections?
>>>
>>>
>>
>>It is a problem you will see when calling an analogue subscriber over a
>>link with a long latency (such as VoIP). The echo will most probably be
>>generated by a 2- to 4-wire hybrid at the far end. In a pure amalogue/tdm
>>path you would perceive the reflected energy as a plesent sidetone. As
>>soon as the latency increases to 50-100ms the refelcted energy will be
>>perceived as an echo instead.
>>
>>The options available to you are to live with the echo of your own voice
>>or to insert an echo canceller at the pstn interface. Asterisk includes an
>>echo canceller that may or may not be good enough. It seems to like some
>>pstn interfaces and not others. If the Asterisk echo canceller is not
>>enough you may consider an expensive inline echo canceller.
>>
>>
>
>The definity has echo cancellation. Try turning that on.
>
>-SteveK
Thanks for both of
your replies.
My Definity
connection is on a TN464C (the TN464G has echo cancellation) and I was hoping
to try a software solution first before investing in the hardware (we would
also have to upgrade our Definity software, so the total cost is quite
high).
I have noticed
that any of the zapata.conf echo cancel parameters seem to have no effect on an
ISDN-PRI line, using pri_net signalling (I used the voip-info.org wiki for the
configuration). If this is true, and I am not making some dumb mistake, is
there another signalling mode that I can use on a Definity that will take
advantage of echo-cancel?
Barring that, I am
using a Plantronics DSP-100 headset with X-lite under Windows. Can I set
up echo-cancelling there?
Thanks,
Mark.
P.S. Is there
a website where I can post replies to this mailing list? Cutting and
pasting into Outlook is just darn goofy.
M.
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