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52 Cards in this Set

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Exam: What are the SIP messges for the IPTV services
see below
Exam: For the discovery service what are the messages
Event Notification
Subsribe and Notify
Exam:What is the message for user authenication?
Same as the registar
Exam:What is the message for the UBICAST service?
INVITE and 200 OK
Exam:What is the message for the pay per view service?
INVITE and 200 OK
Exam: What is a call center?
IVR. ACD, &CTI
What is an IP based call center?
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)
What are advantages of IP based call center
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
New Challenges for VoIP
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
Location Issues for VoIP
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.
FCC Ruling on VoIP
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
Three phases of E911 migration to VoIP
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
1. SIP is the VoIP standard from _____.
a. IEEE
b. IETF
c. ITU-T
d. ANSI
1. _B___
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___
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__
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___
5. What is the default signaling channel (port number) for SIP?
a. 1720
b. 3384
c. 5060
d. 10000
5. _C___
6. The SIP Message format (encoding) is based on ______
a. SNMP
b. HTTP
c. H.323
d. SS7
6. __B__
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_
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_
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_
10. Which of the following message is optional in SS7 call setup?
a. IAM
b. ACM
c. CPG
d. ANM
10. __C_
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__
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_
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_
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_
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_
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__
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__
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__
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__
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__
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___
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___
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__
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___
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__
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__
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__
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__
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___
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__
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__
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__
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_
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__
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_
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__
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__
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_
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_
20. Traffic engineering is usually based on
a. Mother’s day traffic
b. BSBH
c. Peak daily traffic
d. Peak monthly traffic
20. __B__