PBX systems for IP telephony /

• Main Author: Sulkin, Allan
• Corporate Author: McGraw-Hill
• Format: Book
• Language: English
• Published: New York : McGraw-Hill, 2002
• Series: McGraw-Hill telecom professional
• Subjects: Internet telephony; Telephone > Private branch exchanges; Τηλεφωνία μέσω διαδικτύου