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The road to IP Telephony : how Cisco Systems migrated from PBX to IP Telephony
- "The road to IP Telephony : how Cisco Systems migrated from PBX to IP Telephony"
- "The road to IP Telephony : how Cisco Systems migrated from PBX to IP Telephony"@en
- "The road to IP telephony : how Cisco systems migrated from PBX to IP telephony"@en
- "The road to IP Telephony how Cisco Systems migrated from PBX to IP Telephony"@en