Source Destination SRTP Comment8IPLD PSTN S The encryption will be between the IP terminal and theVoIPDB. Once the voice leaves the SL2100 to the public net-work it cannot be encrypted.8IPLD IP Network (SIP) S The encryption will be between the IP terminal and theVoIPDB. Once the voice leaves the SL2100 to the SIP net-work it cannot be encrypted.8IPLD Encryp-tion On8IPLD Encryption Off N‘S = Supported N = Not SupportedPSTNIP NetworkChassisSTD SIPNot EncryptedEncrypted8IPLD/DT8008IPLD/DT8008IPLD/DT800SRTPFigure 9-6 8IPLD EncryptionConditions• Encryption is not supported on 8IPLD series phones that are connected via NAPT.• If the encryption feature is enabled in terminal programming but not licensed, the terminal displays“Invalid server” and will not function.13.4 General IP ConfigurationThe voice quality of VoIP depends on variables such as available bandwidth, network latency, andquality of service initiatives (QOS). These variables are controlled by the network and Internet serviceproviders. Because these variables are not in NEC control, NEC cannot guarantee the performance ofthe users IP based voice solution. NEC recommends connecting the VoIP equipment through a localarea network using private IP addresses.To ensure a network meets the specific requirements for VoIP implementation, an IP ready check anda site survey must be completed at each site before VoIP implementation.• One way delay must not exceed 100ms.• Round trip delay must not exceed 200ms.• Packet loss must not exceed 1%.• Data switches must be manageable.• Routers must provide QOS.• There must be adequate bandwidth for estimated VoIP traffic. Refer to Section Bandwidth onpage 9-26.Depending on how QOS policies are built in the network, assignments may be needed in both theCPU and IP terminal. The NEC SL2100 supports the flagging of packets at layer 2 (VLAN tagging802.1Q/802.1P) and at layer 3 levels.SL2100 ISSUE 1.09-14 IP Multiline Station (SIP)
