bt 21cn造句

• The Lumison network is based on a SS7 interconnect with BT ( with voice traffic being terminated as SIP using Cisco hardware ) as well as a new BT 21CN pure-IP interconnect.
• Annual savings of ? billion per annum were expected when the transition to the new network was to have been completed in 2010, with over 50 % of its customers to have been transferred by 2008 . ( For actual progress see BT 21CN ).
• However, the omission of Marconi from the BT 21CN supplier list, the lack of a suitable replacement softswitch to match System X reliability, and the shift in focus away from telephony onto broadband-all led to much of the System X estate being maintained.