[Asterisk-Users] Noise using TE410P & Rhino Channel Bank

[Eddie]

Anyone ever experience noise instead of a dial tone. We are using a Digium
TE410P and 2 units of Rhino FXO & FXS Channel Bank.
Everything works well when they are freshly turned on or rebooted, but after
a while there's only noise can be heard instead of dial tone.
Does this have anything to do with the timing configuration?
Where is this time is generated from, is it from the TE410P card?
How can get rid of this noise? Please advice.
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