Instruction manual

Features
IP Telephony
Strata CTX General Description 10/04 75
IP Telephony
Data Network Assessment for Voice Traffic
System Availability: Strata CTX100, CTX670
Important! Voice over Internet Protocol (VoIP) can be affected by numerous factors related to
network structure and design. To prevent delays, jitter and voice data packet loss,
and achieve optimum VoIP traffic performance, your network must be designed or
redesigned for voice traffic with priority over data.
Toshiba highly recommends that the installing dealer assess the existing network for proper
handling of voice traffic and make sure it provides the required bandwidth per the number of
deployed VoIP instruments. Toshiba is not responsible for: network assessment for voice traffic,
network design/redesign or network support outside the topology it provides. Nor is Toshiba
responsible for diminished Quality of Service (QoS) caused by networks not capable of providing
necessary VoIP bandwidth.
Expected voice QoS as it relates to network parameters is shown in Table 41 on page 112.
Overview
The CTX supports Toshiba proprietary IP telephones, enhancing the CTX VoIP capabilities, and
providing powerful IP telephony add-on solutions for remote users. The Toshiba IPT1020-SD IP
telephone is compatible with Strata CTX100 and CTX670 systems with R2.0 or higher software.
The Toshiba IP telephony strategy is based upon a transitional approach. For most enterprises, the
migration path to IP telephony will be a gradual process rather than an event in time. Instead of
acquiring IP technology benefits through complete system replacement at higher cost and higher
risk, most enterprises prefer to integrate voice and data IP traffic into their existing telephone
systems as the need arises. This protects their investment in existing voice and data networks and
represents a low risk migration path. Toshiba has transformed Strata CTX systems into IP-enabled
communication systems to achieve this very important objective.
IP Telephone
System Availability: Strata CTX100, CTX670
The Toshiba IPT1020-SD IP telephone supports almost all the same Strata CTX features as 3000-
series digital telephones, extending the functionality of the Strata CTX to any location supported
over an IP network. The only feature the IPT1020-SD telephone does not support is Speaker Off-
hook Call Announce, but it does support Off-hook Call Announce over telephone handset. (For a
photo, see
“IP Telephone” on page 43).
CTX IP Protocol
System Availability: Strata CTX100, CTX670
CTX IP uses an industry standard IP communication protocol, RFC3015 Media Gateway Control
(MEGACO+). Toshiba chose the MEGACO+ protocol for call control because it provides better
stimulus response that makes the telephone work efficiently over the IP network local area or wide
area network (LAN or WAN). In fact, Toshiba uses an enhanced version of MEGACO+ that
enables the Strata CTX to provide all the feature functionality of DKT3000-series telephone to IP
telephone users much better than could be done using other protocols.
This represents a very powerful feature set, as compared to many competitors’ IP telephones
which don’t support important telephone features such as: