Plantronics Headset Savi W740-M connected to Snom 320 with EHS cable does not beep on an Inbound call

We recently bought a number of Plantronics Savi W740-M headsets. These are paired with Snom 320 phones via the Snom EHS Advanced cable (Snombox). Despite selecting Headset as the ringer device Inbound calls do not cause the headset to beep, as was the case previously with an earlier model Plantronics CS60 headset. Selecting Speaker as the ringer device does cause the Snom 320 to ring. We also selected ring on all devices in the Plantronics Hub.

Has anyone had the same experience?

Has anyone found a solution to the problem?
James YeoAsked:
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Can you connect common headphones and check if problem is with sound card or with plantronics?
James YeoAuthor Commented:
We have just established that there is a version 2.0 Snombox which solves the problem

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James YeoAuthor Commented:
We only established the solution after creating the question
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