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5 Cards in this Set

  • Front
  • Back
- What is Enterprise Telephony?
- It’s a business telephone system because it provides basic business features, such as hold, three-way calling, call transfer, and call forwarding.

Chapter 2
- List 4 similarities between PSTN and ET
- 1. Circuit Switching [both network switch 64 Kbps circuits]

- 2. Common Infrastructure Model [Bearers, call control and service planes are contained in one platform]

- 3. Local Loop [Phone can be plugged directly into the switch and receive a dial tone]

- 4. Services Offered [call hold, three-way calling, call transfer and call forwarding]


Chapter 2
- List the 5 network design business can use.
- 1. Simple business line [line directly from the PSTN ]

- 2. PBX [This switch connects to the PSTN through a T1 or E1]

- 3. Key-system [smaller version of PBS, used in offices with fewer than 50 people]

- 4. Centrex-Line [Lines provided by LEC and offers additional services; transfer, three-way calling]

- 5. Virtual Private Networks [Private dial plan for enterprise customer.]


Chapter 2
- The 3 PSTN- provided telephony networks include the following
- A simple business line [similar to a residential line, but with higher fee]

- A Centrex line [PSTN can offer a CUG-Closed User Group; All phone in the business becomes a virtual switch and user can dial only 4 digits]

- A VPN [ Offers the benefits of a private network without the administration or equipment hassles of a tie-line network ( or permanent circuit)]


Chapter 2
From a VOIP perspective, list the protocols at each layers of the OSI model
Application Layer = Codec

Session Layer = SIP, SDP, H 323

Transport Layer = RTP, RTCP, UDP

Network Layer = IP

Data link Layer = Ethernet

Physical Layer = Cat 5 Cable