T46G Delay when answering

[chethamb]

Hello, we are having an issue with Yealink T46G, when the calls are answered on this handset there is an approx. 3 second delay before the incoming caller can hear the operator, we have replaced the phones with T42G in exactly the same port / switch and the same config and the problem does not occur.

The phone is on firmware 28.80.0.136, please help this is causing major issues