![background image](http://html1.mh-extra.com/html/3com/vcx-v7122/vcx-v7122_user-manual_440856254.webp)
254
V7122 GatewayUser Guide
Content-Type: Application/X-Detect
Content-Length: xxx
Type = CPT
Subtype = SIT
ThroughPacket™
The gateway supports a proprietary method to aggregate RTP streams from several
channels to reduce the bandwidth overhead caused by the attached Ethernet, IP, UDP and
RTP headers, and to reduce the packet / data transmission rate. This option reduces the
load on network routers and can typically save 50% (for example, for G.723) on IP
bandwidth.
ThroughPacket™ is accomplished by aggregating payloads from several channels that are
sent to the same destination IP address into a single IP packet.
ThroughPacket™ can be applied to the entire gateway or, using IP Profile, to specific IP
destinations (see
IP Profile Settings
). Note that ThroughPacket™ must be enabled on both
gateways.
To enable ThroughPacket™ set the parameter ‘RemoteBaseUDPPort’ to a nonzero value.
Note that the value of ‘RemoteBaseUDPPort’ on the local gateway must equal the value of
‘BaseUDPPort’ of the remote gateway. The gateway uses these parameters to identify and
distribute the payloads from the received multiplexed IP packet to the relevant channels.
In ThroughPacket™ mode, the gateway uses a single UDP port for all incoming multiplexed
packets and a different port for outgoing packets. These ports are configured using the
parameters ‘L1L1ComplexTxUDPPort’ and ‘L1L1ComplexRxUDPPort’.
When ThroughPacket™ is used, Call statistics aren’t available (since there is no RTCP flow).
Dynamic Jitter Buffer Operation
Voice frames are transmitted at a fixed rate. If the frames arrive at the other end at the same
rate, voice quality is perceived as good. In many cases, however, some frames can arrive
slightly faster or slower than the other frames. This is called jitter (delay variation), and
degrades the perceived voice quality. To minimize this problem, the gateway uses a jitter
buffer. The jitter buffer collects voice packets, stores them and sends them to the voice
processor in evenly spaced intervals.
Summary of Contents for VCX V7122
Page 28: ...28 V7122 GatewayUser Guide ...
Page 39: ...V7122 Gateway User Guide 39 Reader s Notes ...
Page 40: ...40 V7122 GatewayUser Guide ...
Page 58: ...58 V7122 GatewayUser Guide Reader s Notes ...
Page 66: ...66 V7122 GatewayUser Guide Reader s Notes ...
Page 144: ...144 V7122 GatewayUser Guide Reader s Notes ...
Page 239: ...V7122 Gateway User Guide 239 Reader s Notes ...
Page 240: ...240 V7122 GatewayUser Guide ...
Page 246: ...246 V7122 GatewayUser Guide Reader s Notes ...
Page 270: ...270 V7122 GatewayUser Guide Reader s Notes ...
Page 287: ...V7122 Gateway User Guide 287 Reader s Notes ...
Page 288: ...288 V7122 GatewayUser Guide ...
Page 294: ...294 V7122 GatewayUser Guide Reader s Notes ...
Page 300: ...300 V7122 GatewayUser Guide Figure 88 Gateway s Startup Process ...
Page 315: ...V7122 Gateway User Guide 315 Reader s Notes ...
Page 316: ...316 V7122 GatewayUser Guide ...
Page 332: ...332 V7122 GatewayUser Guide Reader s Notes ...
Page 358: ...358 V7122 GatewayUser Guide Reader s Notes ...
Page 362: ...362 V7122 GatewayUser Guide Reader s Notes ...
Page 389: ...V7122 Gateway User Guide 389 Reader s Notes ...
Page 390: ...390 V7122 GatewayUser Guide ...
Page 398: ...398 V7122 GatewayUser Guide Reader s Notes ...
Page 406: ...406 V7122 GatewayUser Guide Reader s Notes ...
Page 408: ...408 V7122 GatewayUser Guide Reader s Notes ...
Page 409: ...V7122 Gateway User Guide 409 ...
Page 419: ...V7122 Gateway User Guide 419 Reader s Notes ...
Page 437: ...V7122 Gateway User Guide 437 Reader s Notes ...
Page 452: ...452 V7122 GatewayUser Guide Figure 137 UDP2File Utility ...
Page 453: ...V7122 Gateway User Guide 453 Reader s Notes ...
Page 459: ...V7122 Gateway User Guide 459 Reader s Notes ...
Page 475: ...V7122 Gateway User Guide 475 ...