User guide

Telephony and Multimedia Services
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Call Signaling
Call establishment timing has been optimized and is comparable to design
objectives as specified for digital exchange equipment.
8.2.2 Capacity
Providing G.711 ToIP requires 170 kbps per voice channel each way (with
10 ms voice packets). However, VoIP can be provided at lower speed, if
POTS comparable quality is not required.
8.2.3 Security
Identification of a subscriber accessing the VoGW is based on the
subscriber’s IP address. In order to ensure correlation between this IP
address and the IAD, measures have been taken to restrict access to the
Telephony over IP network, whether this network is separated from the
data network by VLAN or by forced forwarding.
When access to the Telephony over IP network does not include a PPPoE
connection, access to the network can be limited to equipment with known
IP address, configured in the IP DSLAM for the specific voice PVC. A filter
in the IP DSLAM thereby prevents address spoofing.
8.3 Multimedia Services
Multimedia services comprise high-quality video applications over IP. Video
over IP is based on standard protocols, independent of type of access as
long as IP and sufficient capacity can be provided to the home. However,
the network must support IP multicasting in order to distribute broadcast
programming such as live TV, premium channels, Pay Per View (PPV), and
Near Video on Demand (NVOD).
A solution for Video over IP consists of the following main parts:
• Customer Premises Equipment (CPE) - A Set-top Box
• Network platform - A broadband IP access and backbone network
supporting IP multicast and Quality of Service (QoS)
• Service platform - Contains the servers and systems that implement
and deliver the broadcast and interactive TV services to the end-users.
• Content creation platform - Providing the tools and processes needed
to create and maintain the service offerings of the service platform.