NEC UNIVERGE SL2100, Networking Manual

Page: 99 / 196

IP Multiline Station (SIP)
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1 INTRODUCTION
The NEC SL2100 system supports IP extensions. These telephones have the same look and
functionality as typical multiline telephones, but they are connected to the CPU via IP rather than by a
hardwired connection to a station card.
The following terminal is supported.
• IP7WW-8IPLD-C1 TEL
The voice quality of VoIP is dependent on variables such as available bandwidth, network latency and
Quality of Service (QoS) initiatives, all of which are controlled by the network and Internet Service
Providers. Because these variables are not in NEC control, it cannot guarantee the performance of the
user’s IP-based remote voice solution. Therefore, NEC recommends connecting VoIP equipment through a
local area network using a Private IP address.
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2 IP TO TDM CONVERSION
When an IP telephone calls a [ ]TXH-A1 multiline telephone, single line telephone or trunk, the speech
must be converted from IP to TDM (Time Division Multiplexing) technology. The VoIPDB daughter
board provides this function.
It is possible for 8IPLD IP Phones to talk directly to other 8IPLD IP Phones without using a VoIP DSP
resource. For more information, refer to
Peer-to-Peer on page 9-3 .
2.1 8IPLD IP Multiline Telephones
The IP multiline telephone operates in the same way as a digital multiline telephone. It has all features
and flexibility you expect from a digital multiline telephone. The difference is that the IP telephone has
an RJ-45 for connection to an IP network, rather than an RJ-11 for connection to a digital extension
port.
Networking Manual 9-1
IP Multiline Station (SIP)
9