NEC UNIVERGE SL2100, Networking Manual

Page: 112 / 196

Source Destination SRTP Comment
8IPLD PSTN S The encryption will be between the IP terminal and the
VoIPDB. 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 the
VoIPDB. Once the voice leaves the SL2100 to the SIP net-
work it cannot be encrypted.
8IPLD Encryp-
tion On 8IPLD Encryption Off N‘
S = Supported N = Not Supported
PSTN
IP Network
Chassis
STD SIP
Not Encrypted
Encrypted
8IPLD/DT800 8IPLD/DT800 8IPLD/DT800
SRTP
Figure 9-6 8IPLD Encryption
Conditions
• 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 Configuration
The voice quality of VoIP depends on variables such as available bandwidth, network latency, and
quality of service initiatives (QOS). These variables are controlled by the network and Internet service
providers. Because these variables are not in NEC control, NEC cannot guarantee the performance of
the users IP based voice solution. NEC recommends connecting the VoIP equipment through a local
area network using private IP addresses.
To ensure a network meets the specific requirements for VoIP implementation, an IP ready check and
a 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 on
page 9-26 .
Depending on how QOS policies are built in the network, assignments may be needed in both the
CPU and IP terminal. The NEC SL2100 supports the flagging of packets at layer 2 (VLAN tagging
802.1Q/802.1P) and at layer 3 levels.
SL2100 ISSUE 1.0
9-14 IP Multiline Station (SIP)