Coms plc (LSE:COMS.L), Media and Press Releases

Coms Xstream enables up to 52 concurrent quality VoIP calls via one ADSL connection

Coms Xstream reduces the bandwidth overhead so that more VoIP calls can be made on an ADSL line, and in doing so, Xstream also improves Quality of Service (QoS) as voice packets are treated as priority.

For more information, feature comment or case studies please contact tom@raniericoms.com

London,UK, February 2008: Coms.Net, provider of VoIP business telephony solutions today announces Coms Xstream, a new VoIP compression technology that dramatically improves the number of calls over an ADSL connection, but crucially maintains call quality. The solution is available to all customers who currently utilise the Coms.net hosted VoIP service aimed at small and medium sized businesses.

Terry Martin, CEO of Coms.Net, commented, “VoIP technology has so far had an unsteady reputation and it’s usually down to the quality of calls. This is mainly due to the fact that regular SME ADSL lines are up and down in terms of quality. We are extremely excited by Xstream as it dramatically improves the quality of VoIP calls over a regular line by utilising compression and prioritisation technology, that has a side effect of being able to let you make more calls over a regular ADSL line.”

Coms Xstream overview

Coms Xstream reduces the bandwidth overhead so that more calls can be made on an ADSL line. In doing so Xstream also improves Quality of Service (QoS) as voice packets are treated as priority.

As ADSL is slower sending than receiving data (i.e. the uplink has lower bandwidth than the downlink), the number of calls that can be made is limited by the much slower uplink speed (typically 256K or 446k).

Bandwidth is an important issue because VoIP speech is encoded using a codec, the main two codec’s used being G.711 and G.729. G.711 is considered to be the highest quality codec, but it doesn’t compress speech, so it’s very bandwidth hungry, while G.729 is considered the best match between compression and quality.

When speech is sent over the Internet there is still a “transport overhead” for each call that increases the bandwidth used by a VoIP call, however, Coms Xstream uses only one transport overhead for all calls, thereby maximising the available bandwidth.

To view the bandwith comparison table click here

How Coms Xstream Works

Voice is no longer treated as simply another type of data, which happens to have a high priority. Instead, it is treated as a data stream with very specific requirements not only in terms of priority, but also in terms of spacing between packets. Voice and data can readily coexist on a single link. Data transfer rates are not compromised by the fact that voice is present. Classes of data can be given their own share of available bandwidth in a much more granular way than traditional QoS.

Coms Xstream benefits and features include

• Enables up to 28 concurrent calls on a standard 256k uplink ADSL connection or 52 calls on a 446K ADSL connection.
• Enables delivery of SIP trunking up to 28 ports on a single ADSL connection with only 256k upstream bandwidth, making it a viable replacement for E1 circuits.
• Dynamic and seamless blending of voice and data using QoS allowing FULL utilisation of all purchased bandwidth increasing overall throughput for both voice and data traffic.
• Enables low Broadband bandwidth to be used for VPN connectivity in branch / retail environments offering simultaneous voice and data access.
• Supports multiple Voice protocols.
• Increased security for both voice and data traffic.

For more information on Coms.net and its product/services please contact Tom Warren, on +44 (0) 1296 394 614, or at tom@raniericoms.com

About Coms Plc

Jason Drummond founded Coms Plc in 2000, with a vision of using the Internet to carry and deliver voice telephone calls. Coms.Net is the core service of Coms Plc, which provides a VoIP business telephony service, enabling business customers to have access to state-of-the-art VoIP technology. Unlike other industry competitors, the Coms.Net solution is based upon the industry standard SIP protocol, which enables the widest possible connection of customers, devices and integrated Web 2.0 applications.

Coms Plc is an OFCOM authorised Public Electronic Communications Network (PECN) and a member of the Internet Telephony Service Providers Association (ITSPA). Coms Plc is also listed on the London Stock Exchange AIM market (LSE:COMS).

Further information can be found at http://www.Coms.Net

Agency:

Tom Warren
Ranieri Communications
tom@raniericoms.com
Tel: (0)1296 394614
www.raniericommunications.com