The SIP message flow to and from BVR component can be traced. The SIP message flow includes all incoming and outgoing messages, both those for calls and also those involved with the MRCPv2 resources (Reco and TTS).
To configure the SIP message flow to appear in the BVR trace (trace_X.out) files there are two settings depending on how much information is required.
Setting SIP_MONITOR component to TRACE will show all incoming/outgoing SIP messages. However this will not include any BVR derived SIP information (for example Call Index).
Setting SIP component to INTENSIVE will show all incoming/outgoing SIP messages as processed. These will include BVR non SIP information (for example Call Index).