Every telephone system has to be connected to the main carrier networks to make and receive telephone calls.

Traditionally, this has been achieved using ISDN or analogue services from BT or a similar telecoms carrier.SIP Trunks are the new ISDN connections for Internet Telephony and VoIPsystems.

ISDN30e (30 voice channels) and ISDN2 (two voice channels) are the familiar names of services that are gradually being phased out as the world moves to telephone calls transmitted using data networks using IP(Internet Protocol) - the language of the Internet.

In this new world, ISDN trunks are replaced by SIP Trunks and we offer one of the most competitively prices SIP Trunk services for all users moving to IP telecoms. We partner with Telstra, an international telecoms providers

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Competitive Rates

If you are paying more than 1p per minute for local and national telephone calls, or 9p per minute for mobile calls then we can offer you some very competitive costs.

Telephone costs are an unwelcome expense for every organisation, but with Clearstream these costs can be streamlined. In addition to call costs we can offer competitively priced line rentals, geographic and non-geographic numbers, and all typical telecom line services.

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SIP Trunks and Geographical Numbers

WIth SIP Trunks, a BT geographic number can be "ported" to a SIP Trunk service such as the local number for one of your offices. Once ported, this number can be terminated anywhere in the country using Voice Over IP.

So customers can call a local branch number, and the phone call can be taken wherever you wish it to be - at Head Office - at a Call Centre - it's up to you.

SIP Trunks, in addition to low costs, give the maximum flexibility to your telephone architecture and help you provide excellent customer service and also assist with Business Continuity planning.

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About Telstra

Telstra are Australia's leading telecommunications and informationservices company, with one of the best known brands in the country Telstra offer a full range of services and compete in all telecommunications markets throughout Australia, providing more than 9.0 million Australian fixed line and 10.2 million mobile services, including 6.3million 3G services.

Telstra's main activities include the provision of:

• basic access services to most homes and businesses in Australia
• local and long distance telephone calls in Australia and international calls to and from Australia
• mobile telecommunications services
• broadband access and content
• a comprehensive range of data and Internet services (including through Telstra BigPond®, Australia's leading Internet service provider)
• management of business customers' IT and/or telecommunications services
• wholesale services to other carriers, carriage service providers and ISPs
• advertising, search and information services (through Sensis, Australia's leading directory and search company)
• cable distribution services for FOXTEL's® cable subscription television services.

One of Telstra's major strengths in providing integrated telecommunications services is a vast geographical coverage through both a fixed and mobile network infrastructure. This network and systems infrastructure underpins the carriage and termination of the majority of Australia'sdomestic and international voice and data telephony traffic.

Telstra owns 50% of FOXTEL®, and its international businesses include:

• CSL New World Mobility Group, one of Hong Kong's leading mobile operators
• TelstraClear Limited, the second largest full service carrier in New Zealand
• Reach Ltd, a provider of global connectivity and international voice and satellite services
• SouFun Holdings Limited, a leading real estate and furnishings website in China
• Norstar Media and Autohome / PCPop, leading Chinese internet business in the online auto and digital device advertising sectors
• China M and Sharp Point, two of China's leading mobile content and online music businesses