128To do… Use the command… RemarksConfigure the destinationaddress of UDP packets destination ip ip-addressRequiredBy default, no destination IP address isconfigured.The destination address must be the same as theIP address of the listening service configured onthe NQA server.Configure the destination portof UDP packetsdestination portport-numberRequiredBy default, no destination port number isconfigured.The destination port number must be the same asthat of the listening service on the NQA server.Configure the size of the datafield in each UDP packet data-size size Optional100 bytes by default.Configure the string to be filledin the data field of each UDPpacketdata-fill stringOptionalBy default, the string is the hexadecimal number00010203040506070809.Specify the source port of UDPpackets source port port-number OptionalBy default, no source port number is specified.Configure the source IPaddress of UDP packets source ip ip-addressOptionalBy default, no source IP address is specified.The source IP address must be that of an interfaceon the device and the interface must be up;otherwise, no probe packets can be sent out.Configure optional parametersSee “Configuringoptional parameters foran NQA test group”OptionalConfiguring voice testsNOTE:Do not perform voice tests on known ports, ports from 1 to 1023. Otherwise, the NQA test might fail or thecorresponding services of these ports might be unavailable.Voice tests of an NQA test group are used to test voice over IP (VoIP) network status, and collect VoIPnetwork parameters so that users can adjust the network.A voice test performs the following procedure:1. The source (NQA client) sends voice packets of G.711 A-law, G.711 μ-law or G.729 A-lawcodec type at regular intervals to the destination (NQA server).2. The destination affixes a time stamp to each voice packet that it receives and then sends it back tothe source.3. Upon receiving the packet, the source calculates results, such as the delay jitter and one-way delaybased on the packet time stamps. The statistics reflect network performance.Voice test result also includes the following parameters that reflect VoIP network performance:
