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52 Cards in this Set
- Front
- Back
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Exam: What are the SIP messges for the IPTV services
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see below
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Exam: For the discovery service what are the messages
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Event Notification
Subsribe and Notify |
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Exam:What is the message for user authenication?
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Same as the registar
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Exam:What is the message for the UBICAST service?
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INVITE and 200 OK
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Exam:What is the message for the pay per view service?
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INVITE and 200 OK
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Exam: What is a call center?
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IVR. ACD, &CTI
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What is an IP based call center?
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Voice Gateway: interface to the PSTN
Call Manager: SIP proxy or H.323 GateKeeper IVR Server: greeting, announcement, information collection, queuing Contact Manager: Agent information, Agent state/control, routing algorithm to agents (ACD), queue control, IVR control, etc. NAS: network attached storage (database) |
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What are advantages of IP based call center
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Ease of Automatic Call Distribution (ACD), and does not rely on SS7 (TCAP) for call distribution
Enterprise can easily control and manage the call routing Even a small business can operate a call center and give an impression to the customer as a large enterprise operation. New and enhanced features distribution and access to the customer data integrated telephony services ease to implement call back (click to call) Mobility, Ease of Acces of Data and Ease of creating new services |
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New Challenges for VoIP
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Location based Call Routing
N11 (ex. E911) 1-800 calls Security – is there a need? Is there an issue of e-mail security? CALEA - wiretapping |
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Location Issues for VoIP
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N11 Services.
N11 numbers are “attached” to a particular telephone circuit. The routing of N11 is based on caller’s number rather than dialed number. The VoIP provider is not able to use the regular “look-up” tables that are used to send the call to the nearest/proper terminating point. Similar issues for toll-free number, where calls are routed based on the callers location. The national Poison Control Center number is 800-222-1222, and the call is routed to the nearest Poison Control Center. |
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FCC Ruling on VoIP
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On May 19, 2005, the FCC took steps to protect consumers by requiring that VoIP service providers to offer enhanced 911 (E911) emergency calling capabilities to their customers.
Requirements apply to service providers offering connection to PSTN. Specifically, the order requires: Interconnected VoIP providers must deliver all 911 calls to the customer’s local Public Safety Answering Point (PSAP) Interconnected VoIP providers must provide emergency operators with call back and location information of their customers (i.e., E911) The VoIP provider must provide the customer a means of updating the location information, regardless of their location Thus far, there has been no FCC action on other N11 or 1-800 services |
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Three phases of E911 migration to VoIP
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Phase 1 - CLEC VoIP Service Provider routes call through LEC
Phase 2 - Will be routed from CLEC VoIP Service provider directly to Tandem switch via dedicated TDM trunks Phase 3: No PSTN. User dials 911 which is translated into SIP address like SOS@domain, using DHCP the domain will be found. The SIP message includes the (geo and civel) location information. The call back data is in the Contact filed of SIP message The SIP message will be translate into PSAP |
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1. SIP is the VoIP standard from _____.
a. IEEE b. IETF c. ITU-T d. ANSI |
1. _B___
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2. Which of the following is NOT a required data field in the SIP INVITE message?
a. Via: b. From: c. To: d. Subject: |
2. _D___
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3. Which of the following is a correct statement of the SIP proxy server?
a. It is required for all SIP calls. b. It supports both stateful and stateless SIP call services. c. It is to map (redirect) a SIP address to zero or more call parities for the requested client. d. It is a database server to bind users and their URL. |
3. _B__
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4. Which of the following SIP message is not needed if the call session is between two network devices (instead of human-to-human calls)?
a. INVITE b. 180 Ringing c. 200 OK d. ACK |
4. _B___
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5. What is the default signaling channel (port number) for SIP?
a. 1720 b. 3384 c. 5060 d. 10000 |
5. _C___
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6. The SIP Message format (encoding) is based on ______
a. SNMP b. HTTP c. H.323 d. SS7 |
6. __B__
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7. A SIP phone requires _______
a. User Agent Client (UAC) only, no UAS b. User Agent Server (UAS) only, no UAC c. Both UAC and UAS d. UAC and Prosxy server |
7. __C_
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8. Which of the following is a data field of Session Description Protocol (SDP)?
a. Call Sequence b. User Password c. Caller ID d. Media Attribute |
8. __D_
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9. Which of the following SIP message includes Session Description Protocol (SDP) in its message body?
a. 100 Trying b. 200 OK c. 404 Not Found d. ACK |
9. __B_
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10. Which of the following message is optional in SS7 call setup?
a. IAM b. ACM c. CPG d. ANM |
10. __C_
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11. Which SIP message is comparable to the Alerting message of Q.931?
a. INVITE b. 100 Trying c. 180 Ringing d. 200 OK |
11. __C__
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12. Which message is sent when there is no activity on an MTP2 link?
a. Message Signal Unit (MSU) b. Link Status Signal Unit (LISU) c. Fill-In Signal Unit (FISU) d. Protocol Signal Unit (PSU) |
12. __C_
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13. What is the network address to route ISUP messages on the SS7 network?
a. Point Code b. IP address c. 802.3 Address d. E.164 |
13. __A_
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14. According to the SIP architecture, which of the following is NOT a standard SIP server?
a. SIP Proxy Server b. SIP Redirect Server c. SIP Registrar d. SIP Media Server |
14. __D_
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15. What is the SS7 A-link?
a. Signaling Link between SSP and STP b. Signaling Link between STP and STP c. Signaling Link between SCP and SCP d. Signaling Link between SSP and SSP |
15. __A_
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16. How is a TDM trunk identified on the SS7 network? It is identified by _____.
a. IP Address b. ISDN B channel c. UDP port number d. Circuit Identificaiton Code (CIC) |
16. __D__
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17. Which of the following signlaing is NOT supported on the local telephone switch?
a. ISDN/Q.931 b. SIP c. SS7 d. Station Signaling |
17. __B__
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18. Which of the following is an exampl of Advanced Intelligent Network (AIN) services?
a. E911 calls b. Operator assisted calls c. 1-800 calls d. SIP to PSTN calls |
18. __C__
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19. What is the signaling between SIP-enabled IP-PBX and PSTN switch?
a. SIP b. H.323 c. ISDN Q.931 d. SS7 |
19. __C__
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20. What is the SIP Client software used in the TDC464 SIP Lab exercise?
a. X-Lite b. Cisco Call Manager c. Asterisk d. Microsoft Office Communication Server |
20. __A__
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1. Which of the following could serve as the protocol for communications between two neighboring Media Gateway Controller ( MGC MGC)?
a. MGCP b. SS7 c. Q.931 d. None of the above |
1. _B___
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2. Which of the following could serve as the protocol for communications between two neighboring Media Gateway ( MG MG)?
a. MGCP b. SIP c. Q.931 d. None of the above |
2. _D___
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3. In the MGCP model, a connection is ____?
a. An end-to-end call and the collection of the RTP sessions associated with the call. b. A signaling link between SG and STP. c. An establsihed relationship between an endpoint and an RTP session d. A supplemental service from a carrier to the enterprise users. |
3. _C__
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4. Which of the following is a message from MG to MGC (e.g., MG informs MGC of certain events)?
a. CRCX b. MDCX c. RQNT d. NTFY |
4. _D___
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5. Which of the following device supports codec (such as G.711)?
a. Media Gateway Contoller b. Media Gateway (Access) c. SIP Proxy d. Signaling Transfer Part (STP) |
5. _B__
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6. What is the objective of the IETF SIGTRAN workgroup?
a. To address the issues of transporting telephony signaling (scuh as SS7) within the IP network. b. To address the interwork issues between VoIP and Voice over ATM c. To address the issue of interworking between SIP and H.323 d. To address the issue of SIP peering between carrier networks |
6. _A__
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7. Which of the following is an advantage of SCTP over TCP?
a. SCTP has less overhead than TCP. b. SCTP provides better QoS. c. SCTP supports multi-homing over multiple links. d. SCTP supports both IP and non-IP networks, while TCP is for IP only. |
7. _C__
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8. Which of the following is a correct description of Application Server Process (ASP) in M3UA?
a. It has a one-to-one relationship with Application Server (AS) b. It can be spread across multiple IP addresses, support multi-homing. c. It contains a set of routing keys for the corresponding SS7 links. d. It is a server in the M2UA protocol. |
8. _B__
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9. Which Signal Unit (SU) is not supported in M2PA?
a. Fill-in Singla Unit (FISU) b. Message Signla Unit (MSU) c. Link Status Signal Unit (LSSU) d. None of the above (all three SUs are supported in M2PA) |
9. _A___
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10. When an IP network interworking with the SS7 network, the signaling link between Signaling Gateway (SG) and STP is
a. A-link b. B-link c. C-link d. F-link |
10. _B__
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11. Which of the following standard is provided on IP phones to support QoS?
a. DiffServ b. MPLS c. 802.1p d. RSVP |
11. __C__
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12. Which of the following is a technology to virtually separate voice and data traffic on the same physical network? For example, it supports using different IP subnets for voice and data traffic.
a. MPLS b. IntServ c. DiffServ d. RSVP |
12. __A__
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13. Which of the following is correct about MG and MGC deployment?
a. Each MGC can serve only one MG, one-to-one mapping. b. An MGC can serve many MGs on the network c. Multiple MGC are required to serve a single MG on the network. d. It is common to deploy MG without MGC on the network. |
13. __B_
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14. If a softswitch (SG+MGC) has call capacity of 1M BHC. How many calls can the softswitch process in one second?
a. 73 calls per seconds b. 132 calls per seconds c. 256 calls per seconds d. 277 calls per seconds |
14. __D__
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15. What is the measurement of traffic intensity?
a. calls per seconds b. call holding time in seconds c. bit per second (bps) d. Erlang |
15. __D_
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16. What is the relation between Erlang and CCS?
a. CCS = 36 Erlangs b. Erlang = 36 CCS c. Erlang = CCS d. Not related to each other |
16. __B__
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17. If the call arrival rate is completely random, it can be modeled by
a. binomial distribution b. normal distribution c. Poisson distribution d. None of the above |
17. __C__
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18. Erlang B Model is also called
a. Lost calls cleared b. Lost calls retried c. Lost calls delayed d. Lost calls queued |
18. __A_
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19. Which of the following is NOT a parameter of the Erlang-B model?
a. Call Demand (traffic intensity) b. Network Resource (trunks) c. Grade of Service (blocking probability) d. Number of subscribers |
19. __D_
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20. Traffic engineering is usually based on
a. Mother’s day traffic b. BSBH c. Peak daily traffic d. Peak monthly traffic |
20. __B__
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