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5 Cards in this Set
- Front
- Back
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- What is Enterprise Telephony?
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- 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 |
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- List 4 similarities between PSTN and ET
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- 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 |
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- List the 5 network design business can use.
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- 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 |
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- The 3 PSTN- provided telephony networks include the following
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- 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 |
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From a VOIP perspective, list the protocols at each layers of the OSI model
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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 |
