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Telesis Systems Offering H.323 Protocol
The applied standards for H.323 umbrella protocol are H.225.0 (07/2003) version 5, H.235 (05/2003) version 3, H.245 (07/2003) version 12, H.450 (09/1997), AES FIPS PUB 197.
Telesis systems integrate both packet and circuit switching technology. A Telesis system featuring an integrated gatekeeper provides an economical way for administrators to manage a central database of phone numbers without the expense of a separate-box gatekeeper solution. Number/IP translation is performed through Telesis advanced routing algorithm. Together with the integrated gatekeeper, call authorization, call management, enhanced billing functions, flexible routing algorithms and extensive business telephony features make a Telesis system serve as a feature-rich communication platform. Integrated gatekeeper allows calls to be placed direct or gatekeeper routed between H.323 entities in various circumstances.
The integrated H.323 gatekeeper may serve to numerous H.323 users
Capability of registering to multiple H.323 gatekeepers at the same time provides multipath VoIP access
Telesis systems support numerous H.323 users (entities) which can be terminals, gatekeepers or gateways.
H.323 entities may be terminals, gatekeepers, gateways at the same time
Furthermore, Telesis systems are with media proxying capabilities. The integrated media proxy provides a transit point for media (audio) streams between H.323 entities. The media proxy operates only for the integrated gatekeeper routed calls in some circumstances.
While voice bridging distant offices over the IP, security of a VoIP call is guaranteed with the encryption (optional) of voice according to 256 bit AES (AES-256).
Telesis systems support AES 256 media encryption over H.323
While connecting to the long distance call operator over the IP, the Telesis system may register to an external gatekeeper of the operator as an option. With the advanced routing algorithms and alternate routing capability, TDM calls from a terminal equipment of the system may be routed to a selected operator over the IP or PSTN. Alternate routing capability provides automatic fall back to the PSTN if the IP network is unaccessible.
Advanced routing algorithms and alternate routing capability ensure call progress
Layers and Options
The physical layer of H.323 protocol in Telesis systems is 10/100 BaseT Ethernet. Several ethernet and other properties for H.323 are programmable.
A Telesis system is equipped with well-known audio codecs featuring audio compression as well. Audio codec preference list and properties such as silence suppression (VAD-Voice Activity Detection), frame length are programmable for the system. Currently available codecs for VoIP calls are:
An AT&T certified G.168 echo canceler meets and exceeds G.168-2002 standards. The echo canceler can operate with delays as high as 128msec. It is better than industry standard cancelers under the most important and difficult conditions like double-talk and the presence of background noise.
Route and Routeset Configuration
In a Telesis system, an H.323 endpoint may have its own route number. It is possible to define numerous distinct routes. A given route to a particular destination and its accompanying alternate routes are grouped in a routeset. Each route in a routeset has a priority order. Alternate routes may be H.323 endpoints or TDM (PSTN) lines. Routing to the next priority alternate route is possible in the event that a route becomes unavailable.
As an IP-TDM gateway, the Telesis system routes a call from the TDM network to the IP network according to:
H.450 Supplementary Services
Telesis systems support various H.450.x series supplementary services in H.323 protocol stack, such as:
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