In this troubleshooting case, it probably is better that there is NO dialtone, which would make the hiss easier to hear.
I am curious what the OP found
When Asterisk is stopped, does the hiss continue?
That would help to narrow down the location of the problem
It sure sounds to me as if it is a hardware problem within the card or even the module, rather than on the PCI bus or within Asterisk

John Novack


Tzafrir Cohen wrote:
On Thu, Jun 07, 2007 at 04:50:55PM -0600, Stephen Bosch wrote:
Tzafrir Cohen wrote:
To generate a FXS dialtone without Asterisk, use fxstest (make fxstest)
from the zaptel source directory.
Can I break this dial tone with DTMF?

No.

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