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Why can't I hear voice?

I wrote VCL6 based on TAPI using Cisco TSP3.1.

My app run well. But I can't hear voice.

then I test Cisco IP SoftPhone, I can hear voice.

My app didn't use RTP stream just Wave Driver.

Can anyone tell me why?

Thanks

1 REPLY
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Re: Why can't I hear voice?

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