[Freeswitch-users] FreeSWITCH+Sangoma with dialup modems

[Moises Silva]

On Mon, Dec 10, 2012 at 9:24 PM, Sirish Masur Mohan <
Sirish.MasurMohan at oa.com.au> wrote:

> Hi Moises,****
>
> ** **
>
> Thanks for the reply. I have been able to resolve this issue – looks like
> I had to explicitly choose the modem carrier (1200) using the +MS command.
> ****
>
> However, curious to know a bit more on the echo canceller that you are
> referring to – we are using the Sangoma card with echo canceller, and I
> haven’t explicitly turned it off!****
>
> **
>
Echo cancellation is not a good idea in data calls. Mind you, depending on
the type of data call there is variable tolerance. Also, some data calls
(ie fax) start by sending a well-known tone that Sangoma echo canceller
recognizes and then disables itself (see CED tone here:
http://telecom.tbi.net/fax-call.htm).

If it's working for you, good :) ... if you start having issues with some
calls succeeding some not, now you know another thing to try (turn off the
ec).


*Moises Silva
**Manager, Software Engineering***

msilva at sangoma.com

Sangoma Technologies

100 Renfrew Drive, Suite 100, Markham, ON L3R 9R6 Canada


t.   +1 800 388 2475 (N. America)

t.   +1 905 474 1990 x128

f.   +1 905 474 9223



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