22When it is unnecessary to fix the port number forMPEG-4 image transmission such as when using ina particular LAN environment, it is recommended toselect "Unicast port (AUTO)".Unicast port (MANUAL): Up to 16 users can access asingle camera concurrently. It is necessary to select"Unicast port1 (Image)" and "Unicast port2 (Audio)"manually to transmit images and audio from thecamera.It is possible to fix the port number of the router usedfor MPEG-4 image transmission via the Internet bysetting "Unicast port (MANUAL)". ( page 68)Refer to the operating instructions of the router inuse.Multicast: No concurrent access limitation for a cam-era. Complete the entry field of "Multicast address","Multicast port" and "Multicast TTL/HOPLimit" whentransmitting MPEG-4 images with multicast.Refer to "Operating Instructions" for further informationabout the maximum concurrent access number.Default: Unicast port (AUTO)[Unicast port1 (Image)] * 1Enter the unicast port number (used to transmit imagesfrom the camera).Available port number: 1024 - 50000 (Only even num-bers are available.)Default: 32004[Unicast port2 (Audio)] * 1Enter the unicast port number (used to transmit audiofrom the camera).Available port number: 1024 - 50000 (Only even num-bers are available.)Default: 33004[Multicast address] * 2Enter the multicast IP address.Images and audio will be transmitted to the designatedIP address.Available IPv4 address: 224.0.0.0 - 239.255.255.255Note:Enter a multicast address after checking availablemulticast address.Available IPv6 address: Multicast address startingfrom "FF"Default: 239.192.0.20[Multicast port] * 2Enter the multicast port number (used to transmitimages from the camera).Available port number: 1024 - 50000 (Only even num-bers are available.)Default: 37004[Multicast TTL/HOPLimit] * 2Enter the multicast TTL/HOPLimit value.Available value: 1 - 254Default: 16Important:• When transmitting an MPEG-4 image via a network,the transmitted image sometimes may not be dis-played. In this case, refer to the network administra-tor.• When two or more network interface cards areinstalled on the PC in use, the network interfacecard(s) not used for receiving images should beinvalidated when displaying images using the multi-cast port.*1: It is necessary to designate the unicast port numberwhen "Unicast port (MANUAL)" is selected for"Transmission type".*2: It is necessary to designate the multicast IP addresswhen "Multicast" is selected for "Transmission type".*3: Images will not be transmitted for access using thedifferent IP address version set for "Multicastaddress".