Instruction manual

Networking and connectivity
555-233-767140 Issue 4 May 2003
Internet Protocol (IP)
The capabilities and applications of Communication Manager are extended using
IP. Communication Manager IP supports audio/voice over a LAN or WAN, and it
ensures that remote workers have access to communication system features from
their PCs. Communication Manager also provides standards based control
between media server and media gateways allowing communications
infrastructure to be distributed to the edge of the network.
The Communication Manager IP engine offers features that enables users to
increase the quality of voice communications. The Quality of Service (QoS)
feature enables users to administer and download the differentiated services
type-of-service value to optimize voice quality. The QoS feature reduces latency
by implementing buffers in the audio-processing board, and assists some routers
in prioritizing audio traffic.
Communication Manager IP also includes hairpin and IP-IP direct connections,
two features that make voice communications more efficient. These features
increase the efficiency of voice communications by reducing both per port costs
and IP bandwidth usage.
IP solutions supports trunks, IP communications devices, IP port networks, and IP
control for media gateways. IP solutions is implemented using various IP-media
processor circuit packs inside the servers or the Avaya media gateways. The IP
media processors provides H.323 trunk connections and H.323 voice processing
for IP telephones. The features that use the IP media processor also require the
C-LAN circuit pack or native processor ethernet connectivity.
The IP LAN can also connect through VPN and WAN facilities to extend the
customer IP network across geographically disparate locations. Distributed
communication services (DCS+), or QSIG services, can extend feature
transparency, centralized voice mail, centralized attendant service, call center
applications, and enhanced call routing across IP trunks.
NOTE:
To maximize voice quality using IP, you must consider both your hardware
and network configurations. For example, with IP softphones, you can send
the audio over traditional circuit switch lines, providing high quality voice,
or over IP using LAN connections. The IP network must be a switched
ethernet infrastructure and have the appropriate engineering to
accommodate bandwidth, latency and packet loss requirements to
effectively provide for real-time voice over IP traffic.