1 sec delay when answering using EHS

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We have a customer using EHS with T42G phones and when answering the call with the headset there is a 1 second delay. when answering with the handset there is no delay. T42G Version 29.80.19.7. EHS version 3.16 and EHS hardware version 48.16.0.0. The headset is a Plantronic's Savi W720 which is on the yealink approved headset list. I called Plantronics and they said call control is managed by the EHS and the phone and that there is no adjustments that can be made in the headset to deal with a delay in audio.

In the phone display there is about a 1 second delay before it says answer after pressing the headset button.