rdesktop with sound recording

Dear all,
 
RDP server 7.0 has supported sound recording, while rdesktop 1.7 still did not.
 
Now, I add some codes to rdesktop 1.7 for supporting sound recording.
 
When client begin to connect to the server, client Info PDU will be send during the Secure Settings Exchange phase. The contents of the PDU is clientInfoPduData. In client Info Pdu Data, the field infoPacket indicatesclient information. In info packet, I set flags as RNS_INFO_AUDIOCAPTURE(0x00200000). RNS_INFO_AUDIOCAPTURE indicates that the redirection of client-side audio input to a session hosted on a remote server is supported(rdesktop.c, add code: flags |= 0x00200000).
I also have registed the audio input channel named "AUDIO_INPUT".
 
Connect to win7. In the remote desktop, record device displays as remote audio. Open sound recorder, when press start recording button, the cilent receives no packet related to sound recording. While with the document "[MS -RDPEAI]Audio Input Redirection virtual channel Extension", we know the server will send version PDU to the client for exchanging versions and audio formats at this time.
 
Who can tell me why the client  can't receive version PDU. If I want to realize sound recording with rdesktop i should do what.
Thanks. Sorry for my broken English.
 
Joey

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