LifeSize Gateway-PRI, Руководство пользователя

Страница: 12 / 196

4 LifeSize Gateway User Guide
About Gateway Features
Dual video The LifeSize Gateway supports H.239 standards-based
dual video and TANDBERG DuoVideo technology.
Dual video streams enable a screen to carry video images
from one source while simultaneously displaying images
from a second source.
Conceal caller ID The LifeSize Gateway supports a conceal caller ID
feature that instructs the gatekeeper to conceal the
identity of the calling endpoint on the IP or ISDN
network, whether the presentation restricted feature is
enabled or not.
H.323 fast start The LifeSize Gateway H.323 fast start feature enables
endpoints to join a voice conference in the LifeSize
Gateway more quickly.
ISDN rollover (available in
Gateway-PRI only) The LifeSize Gateway features ISDN rollover. In this
feature, the LifeSize Gateway sends a “busy out” channel
request to the PSTN switch when the current PRI
connection is left with less than a predefined number of
available B channels. The PSTN switch “rolls over” to
the next available gateway.
Network Specific Facility
(available in Gateway-PRI
only) The LifeSize Gateway provides support for Network
Specific Facility Information Elements (NSF IEs) which
enable system administrators to specify to service
providers the equipment, service, or network through
which they want a call routed.
ISDN connection failure The LifeSize Gateway responds to ISDN connection
failure events, by unregistering from its gatekeeper. The
gatekeeper is forced to send new IP-to-ISDN calls
through a different gateway, thus ensuring high call
completion rates. The LifeSize Gateway re-registers to
the gatekeeper when the ISDN connection is restored.
Table 1-1 Gateway Feature Summary (continued)
Feature Description