First 5 seconds of audio cut off

[modo555]

Hello,

I have 4 T58A units I purchased with Skype of business preinstalled on them. I flashed them over to android firmware. They are all working well however they all have this odd behaviour. When I place an outgoing call the first 5 seconds of my speech is cut off. This is even after sending DTMF tones to an IVR. If I use other hard sip phones or soft sip phones on my PBX I cannot replicate the behaviour it's only with the T58A. I have not ruled out something not being installed on my PBX but I'm thinking it's something with the T58A's.

Any assistance is greatly appreciated.