Callback to get non 2xx response of Update message sent after call is conncted

[sumitgambhir9@xxxxxxxxx (sumit gambhir)]

Hi,

I want to know which callback i should implement to get the Non-2XX
response of UPDATE/INVITE SIP message (to update the media i.e.
Hold/Resume) which was sent on a connected Call.

Thanks and Regards,
Sumit Gambhir
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