OpenVox A400P+asterisk=problem With Dial Recall Tone

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Hello, all!
My name is Andrew. I have OpenVox TDM400P card with 2 modules (FXO and
FXS). It plugged to server Asterisk (1.8.13.1) under gentoo (3.3.8-gentoo)
via dahdi (2.6.1 from gentoo portages). All works, but I have a problem:
When I whant to transfer call from FXS to other phone after press flash in
asterisk logs I see “WARNING[21899]: sig_analog.c:3227
__analog_handle_event: Unable to start dial recall tone on channel 4”. And
there no recall tone in phone. Nevertheless, if I enter number of other
phone and hang up – call transfers success. That is, problem is only: no
recall tone. I wrote to support openvox, but there is no result – they advised me
change gentoo+asterisk to elastics

Please help me. What I do wrong?
Thanks for advance Andrew