The cable TV provider, now the UK's largest cable operator and a thriving broadband provider, has signed a five-year deal with Ericsson to migrate its existing voice network to one based on VoIP.
The initial phase of the deal focuses on residential customers, who will be offered a voice-over-broadband service using Ericsson's Internet Protocol Multimedia Subsystem technology.
Telewest's phone network will migrate to VoIP using Ericsson's Telephony Softswitch.
Ericsson claimed that the ultimate aim is to provide a cheaper alternative to traditional landline calls, and to save Telewest's running costs.
"Telewest is already seeing the benefits from its investment in its network, " said Jacqueline Hey, UK managing director at Ericsson. "Our technology will provide gains [for Telewest] in network running costs and efficiency."
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