Which of the following is NOT involved in recording the audio or video streams in a VoIP call

Which of the following is NOT involved in recording the audio or video streams in a VoIP call

• SPAN
• SNMP
• SIP
• SMDR 

 EXPLANATION

SNMP (Simple Network Management Protocol) is a standard Internet protocol used for collecting and analysing information about devices on a network and configuring network devices.
For more information, see: https://technet.microsoft.com/en-gb/library/cc776379(v=ws.10).aspx
SMDR (Station Message Detail Recording) allows detailed information regarding VoIP phone calls to be sent to a recording device.
See: https://downloads.avaya.com/elmodocs2/merlin/r1_5/html/features/smdr/1.htm
SIP (Session Initiation Protocol) is a communications protocol for signalling and controlling multimedia comms sessions, and is a commonly used VoIP protocol,
SPAN (Switched Port ANalyser), is sometimes called Port Mirroring, and is a mechanism used within Ethernet switches to select specific network traffic and send a copy for analyse to a device on a specific port. For call recording this would be used to capture the actual voice content component of the call.
See: https://www.miarec.com/faq/what-is-port-mirroring