1-a United States,Canada- AT&T TR 41449/ 41459 (tested with AT&T network, Canadian network, and MCI network)
1-b United States Bellcore TR 1268;NIUF.302; ANSI T1.607
1-c United States NORTEL DMS-250 BCS36/IEC01 Service
1-d United States Telecordia SR-4287 Service
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