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Originally Posted by Kevin.Beaumont
Indeed. Both NTL and Telewest actually carry a significant amount of PSTN traffic (eg phone calls). If you ring one BT line from another BT line, your call may go through NTL/TW's equipment if BT's Exchanges are busy.
A lot of the truely 'critical' stuff, however, goes nowhere near NTL or TW. They wouldn't be touched with a barge poll (and rightly so).
Even 999 calls and management for NTL and TW is outsourced via Cable and Wireless.
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BT would not use Ntl or Telewest for a BT to BT call. The BT network is far larger, more diverse and more resilient than Ntl's or TW's, the only time they would need to use ntl/TW network would be to deliver a call to either an ntl or tw phone number. Traffic flows from NTL/TW to BT are far greater.
Ntl have about 100 local voice switches nationally, BT probably have that many in London alone!
Ntl does carry traffic for Orange & Vodafone and ironically will also soon be routing some o2 traffic too. (seeing that o2 was once Cellnet and owned by BT! I know whose network I would trust more, oh well I expect they'll learn the hard way like the rest of us!).
It's true that 999 calls etc are still outsourced to C&W in the old CWC areas but in "old" Ntl areas it's done by BT.
