Hi Sergey,
The Quintum D3000 is definately a reliable product – but don’t buy it!!
Quintum have now released the Quintum Digital DX series – the 1xE1 unit is priced very similarly to the D3000 but offers far more features including CODEC auto-negotiation.
The new DX products also run the same, more powerful, OS as the CMS and Call Relay products.
The D3000 will go end of life in 2004.
I hope this information helps, if you require any assistance please feel free to contact me at: mhitchcock@blue-lava.co.uk