I was trying to avoid that one
, as not very relevant to the particular statement I was querying.
It's difficult, as IPStream is I believe pretty well dead. The issue is confused by IPSC (IPStream Connect), which is used to replace it in non-WBC exchanges.
Basically IPStream requires ISPs to have the old BT Centrals. IPSC starts of at the user end like IPStream but can be delivered from the BRAS to the ISPs through their new MSILs on WBC.
Quite how much of the BT ATM cloud is avoided by this I don't know, but I can't imagine many, if any, ISPs are still running Centrals. I'm not even sure support for them hasn't been withdrawn, or is imminent.
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