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VoIP/ToIP Solutions


The remote voice trunking gateway is a customer-located device that complements the Vmux system, providing LAN and compressed voice transmission over both TDM and Ethernet-based networks. Employing powerful voice compression algorithms as well as TDMoIP technology, the solution can compress a full E1/T1 or 4 or 8 analog lines, leaving more bandwidth for data transport.



Voice compression reduces line costs

Vmux-110 remote site voice trunking gateway compresses voice traffic and transports it over an n x 64 kbps, E1/T1 or IP link. The device employs G.723.1, G.729 Annex A and G.711 compression algorithms together with RAD’s unique TDMoIP multiplexing, and is transparent to all signaling protocols and LAN.



Silence suppression improves bandwidth utilization

Voice activity detection and silence suppression allow these Vmux units to dynamically allocate bandwidth for voice traffic. This results in very efficient bandwidth usage, leaving more bandwidth for data transport, further controlled with rate limiting capabilities.



Ethernet portfor data

For data connectivity, the customer-located Vmux-110 features a second 10/100 BaseT port and an Ethernet switch for integrating the user LAN traffic with the compressed voice over an IP, serial or E1/T1 uplink.


Voice Compression


Get more out of Asterisk by offloading codec conversions to Digium's TC voice compression cards. Software transcoding takes up host CPU cycles and can limit the capacity of your server. TC cards are dedicated hardware transcoders; they drastically reduce the bandwidth consumed by each call without ever touching your host CPU. Our voice compression cards are capable of compressing/decompressing 120 channels of G.729 or 92 channels of G.723.1.


The TCE400B is a bundle of the half-length, low-profile PCI-Express x1 TCE400P base card and the TC400M voice processing module. The TCE400B is designed to handle, in dedicated DSP resources, the complex codec translations for highly compressed audio as would otherwise be processed by Asterisk in software.

Asterisk, in software and with Digium G.729a licensing, is capable of transforming the G.729a codec into other codecs for the purposes of call origination or termination, bridging disparate calls, or VoIP to TDM connectivity. These transformations in software are very expensive, in terms of MIPS, and require a substantial amount of CPU time to accomplish.


The PCI Express voice compression card not only relieves the CPU of this duty, freeing it up to handle other tasks or complete additional call processing, but also provides Asterisk with the capability of bridging G.723.1 compressed audio into other formats, a capability not otherwise possible.

The TCE400B decompresses G.729a (8.0kbit) or G.723.1 (5.3kbit/6.0kbit) into G.711 u-law or a-law; or compresses G.711 u-law or a-law into G.729a (8.0kbit) or G.723.1 (5.3kbit). The TCE400B is rated to handle up to 120 bi-directional G.729a transformations or 92 bi-directional G.723.1 transformations. The TCE400B does not require additional licensing fees for the use of these codecs nor does it require the registration process association with Digium's software-based G.729a codec licensing

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