Advise ip microphone, or an ip camera with a good microphone.
The task was to listen as the sellers behind the counter to communicate with customers. looking for ip solutions microphones looking for is not found such, ip cameras as a rule have a bad MIC, but to buy expensive or buy a bad camera and attach a good microphone is not desirable. Voip PBX no.
To connect a microphone to a computer is not an option, it is necessary to be able to allocate the device ip and to stream, can someone faced?