vasUdpSnkSsmSourceIp 1.3.6.1.4.1.2928.2.5.4.3.1.23

The source address if source-specific multicast (SSM) shall be used. Set to empty and vasUdpSnkMcastIpType to `unknown' if multicast shall not be used, or all-zero (0.0.0.0) if multicast but where SSM shall not be used.