•
CCBS
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CCNR
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CFU
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CFNR
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CLIP
•
CLIR
•
COLP
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COLR
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ECT
•
DDI
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HOLD
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MCID
•
MSN
•
UUS
H.323 VOIP PROTOCOL
Standards:
The applied standards 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.
Applications:
Telesis PX24U/PX24M Hybrid IP PBX systems integrate both packet and circuit
switching technology. A Telesis PX24U/PX24M Hybrid IP PBX 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. Telesis PX24U/PX24M Hybrid IP PBX systems support numerous H.323
users (entities) which can be terminals, gatekeepers or gateways. 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
PX24U/PX24M Hybrid IP PBX 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.
Furthermore, Telesis PX24U/PX24M Hybrid IP PBX 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).
While connecting to the long distance call operator over the IP, the Telesis
PX24U/PX24M Hybrid IP PBX 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.
Layers and Options:
The physical layer of H.323 protocol in Telesis PX24U/PX24M Hybrid IP PBX
systems is 10/100 BaseT Ethernet. Several ethernet and other properties for H.323 are
programmable.
Audio Codecs:
A Telesis PX24U/PX24M Hybrid IP PBX 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:
•
G.711 (A and µ)
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G.723.1 (5.3kbps, 6.4kbps)
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G.729
•
G.729A
Echo Cancellation:
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.
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Summary of Contents for PX24M
Page 1: ...PX24U PX24M HYBRID IP PBXs...
