[Sip-implementors] How does SIP server discern whether a new coming call is a video call or a voice call?

[youngerLYT]

Hi,     How does SIP  server discern whether a new incoming call is a video call or a voice call? The differences between the video call messages and the voice call messages are the content described in the SDP. Usually, SIP server won't  parse the content of the SDP in SIP messages. However, the SIP headers do not provide any information to discriminate voice call from video call. Is there any methods to help SIP server discern the incoming call?