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I am trying to setup an Asterisk based phone system where all
extensions are on ATA running SIP protocol. And the CO lines are connected to
Didium WildCards. I am using WildCard TDM400 for FXO connection to POTS
line from SBC. I have tried different loop start signalings with the same
result. The WildCard TDM400 has three FXO ports and one FXS port. I also have
another X100P for an additional FXO port.
The problem happens when I attempt to dial an outside line from an
extension. The extension is an analogue phone connected to a SIP ATA. About
one in three attempts will go though. Other times I will get message from
SBC that the call has failed.
I suspect Asterisk did not give enough time for the
CO line to react to "Off-Hook" signal. Does anyone knows for sure? And if there
is any parameter to change the time somewhere?
Henry Ngai |
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