Engage Communication Launches Voice Gateway Appliance with Echo Cancellation Option.

APTOS, Calif. -- Engage Communication announces the release of a next generation IPTube, the Evolutionary Voice over IP product line. The IPTube DLT1/E1 builds upon the success of the IPTube T1/E1 and IPTube QT1/QE1 to enhance functionality, performance, and value. The IPTube DLT1/E1 product line maintains support for the industry-leading Lossless Data Compression bandwidth minimizer.

The most significant new functionality added with the IPTube DLT1/E1 is the optional Far End Echo Cancellation capability. Echo is one of the most important factors that affect voice quality. The IPTube DLT1/E1 Ecan has an integrated T1/E1 Echo Canceller that cancels up to 64 ms of echo. The echo canceller meets ITU-T G.164, G.165, and ITU-T G.168 requirements. PRI, SS7, CAS, CCS, proprietary out-of-band, and robbed bit signaling is supported. Echo cancellation is automatically disabled during FAX and Modem communications. Voice quality is not compromised.

Far End Echo Canceling

IPTube DLT1/E1-Ecans utilize a Digital Signal Processor that detects and cancels echo at the far end so that the packet network delay has no impact on echo. The echo canceller samples the voice signal, estimates and removes the echo, leaving the original speech. A linear DSP models the echo and performs the main echo cancellation task. A non-linear DSP processor is then optimally employed to subtract out any residual echo or reflected noise components.

"The IPTube DLT1-Ecan and IPTube DLE1-Ecan with Far End Echo Cancellation enables organizations to interconnect their phone systems over Shared Wireless Ethernet, busy Intranets and properly provisioned Internet connections with the elasticity required to maintain crystal clear performance," said President Mark Doyle. "Configurable T1/E1 frame buffers provide hundreds of milliseconds of elasticity without echo since it is cancelled at the far end."

The IPTube DLT1/E1 ships with two T1/E1 interfaces with either one or two active ports. The inactive T1/E1 port can be upgraded in the field for pay-as-you-grow provisioning.

All models ship with dual 10/100BaseT Ethernet LAN ports. The dual Ethernet interfaces provide for:

1) Management interface on LAN port 2 when LAN port 1 is connected to a VPN tunnel

2) The LAN ports can be configured to support Full T1/E1 connections over 2 opposite ADSL links

3) Alternator Option for load balanced SDSL interconnects

4) Protector Option for Redundant Packet Path connections with Constant or Switch Over Criteria

About Engage Communication

Engage Communication, incorporated in 1989, enables multi-site enterprises, small-medium businesses, government, education and telecommunications service providers to take advantage of the lower costs and flexibility associated with IP/Ethernet transport while preserving the enormous investments made in legacy premises equipment such as PBXs, switches, multiplexors, routers, video codecs, encryptors, ....