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E1 R2 to FXS problem

hi, i have simulation, the setup is like this :

phoneA -- Central Switch -- E1R2 -- AS5350 -- 1750 -- FXS -- phoneB

problem:

- When phoneA call phone B, the phone B ring. If the phoneA is down, the phoneB keeps ringing.

I think, this problem similar to FXO Disconnect Supervisor. But i thought that R2 could handle the disconnect supervision well.

I also has already check the cptone for the voice port.

Anyone can help?, thank a lot

here is a sample of debug cas output

!! A make call to B

* RX Seizure

* TX Seizure Ack

!! B ringing

!!A close the call

* RX Idle

!! B keeps ringing

!! B keeps ringing

!! B pickup

* TX Answer

* TX Idle

!! The rings stops, B still of hook

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