Telesis PX24U - CALL ROUTING AND SIP PROTOCOL; Route and Routeset Configuration; Call Routing Logic; H.450 Supplementary Services

Route and Routeset Configuration:
In a Telesis PX24U/PX24M Hybrid IP PBX 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.
Call Routing:
As an IP-TDM gateway, the Telesis PX24U/PX24M Hybrid IP PBX system routes a
call from the TDM network to the IP network according to:
• Dialed digits (called number)
• Calling party number and information elements whenever available, such that:
• Category of calling party
• NOA of calling party
• Numbering plan of calling party
• Presentation status of calling party
• Screening status of calling party
H.450 Supplementary Services:
Telesis PX24U/PX24M Hybrid IP PBX systems support various H.450.x series
supplementary services in H.323 protocol stack, such as:
• H.450.1 Generic functional protocol for the support of supplementary services
in H.323
• H.450.2 Call transfer supplementary service for H.323
• H.450.4 Call hold supplementary service for H.323
SIP VOIP PROTOCOL
Standards:
The applied standard is RFC 3261 SIP: Session Initiation Protocol.
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 SIP registrar provides an economical way for administrators to manage a
central database of phone numbers without the expense of a separate-box registrar
solution.
Telesis PX24U/PX24M Hybrid IP PBX systems support numerous SIP users (entities)
which can be user agents or registrars. Number/IP translation is performed through an
advanced routing algorithm. Together with the integrated registrar, 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.
While connecting to the long distance call operator over the IP, the Telesis
PX24U/PX24M Hybrid IP PBX system may register to an external registrar of the
operator as an option. With the advanced routing algorithms and alternate routing
capability, TDM calls from a terminal equipment connected to 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 SIP protocol in Telesis PX24U/PX24M Hybrid IP PBX systems
is 10/100 BaseT Ethernet. Several ethernet and other properties for SIP are
programmable.
Audio Codecs:
Telesis PX24U/PX24M Hybrid IP PBX systems are 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:
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