Attended transfer no beep

I have some issues this attended transfer.

My installation:
FreePBX 15.0.16
Asterisk 13.22.0

We have incoming call. Agent answer it and try to transfer call to another extension using asterisk attended transfer feature code. Extension successfully answered. After talk, extension was hangup the call. Now call return to agent. But no beep after return. This is a problem.

My features_general_custom.conf:
atxfernoanswertimeout = 10
atxferloopdelay = 1
xfersound = beep
xferfailsound = beeperr
pickupsound = beep
pickupfailsound = beeper

What else can i do to resolve this problem?

Best regards,

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