Examining VoIP Call Streams
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NETW 250 Complete ILabs Package
NETW250
NETW 250 All Week ILabs Pack
NETW 250 Week 1 iLab – How Is the PSTN Used
Today?
1. What is a VPN as you understand it (before
reading AT&T’s description)? (5 points)
2. What is a VPN as AT&T describes it? (5
points)
3. What is the difference between a MPLS and
an IPSec VPN as AT&T explains it? (5 points)
4. What is metro Ethernet? (5 points)
5. What are SONET ring services? (5 points)
6. Does AT&T offer frame relay? (5 points)
7. Does AT&T offer T-carrier service, also
called private line? (5 points)
8. AT&T offers DWDM as a service. What is
DWDM? (5 points)
NETW 250 Week 2 iLab: Avaya IP Office Phone
System
NETW 250 Week 3 iLab: Observing VoIP Protocols
Using Wireshark
NETW 250 Week 4 iLab: Unified Communications
Server Elastix: A One-Server Scenario
NETW 250 Week 5 iLab: VoIP Traffic Engineering
Task 1— Calculate the VoIP traffic load in access trunks to the
Internet.
Q1. What is the number of call-attempts during the busy hour
at the company’s location?
Q2. What is the traffic load in Erlangs during the busy
hour? Show calculation and units.
Q3. What in the dimension of traffic measurement unit Erlang?
Task 2— Calculate the number of SIP trunks and access link bandwidth
required for VoIP calls to the Internet.
Q4. What is the difference between a completed call and a
call attempt?
Q5. What is the number of SIP trunks (lines from the online
calculator) required to meet company’s need?
Q6. What access bandwidth (Kbps from the online calculator)
is required to connect the company’s location to the Internet?
Q7. If T1 bandwidth is 1.544 Mbps, T3 bandwidth is 44.736
Mbps, and there are 28 T1 in a T3, what access connection(s) does the company
need to lease in terms of T1 and/or T3? Show the calculation.
Q8. Enter a screenshot below showing the results from the
Erlang-to-VoIP bandwidth calculator.
Task 3— Calculate the number of backup access channels to the PSTN.
Q9. How many analog lines does the company need to subscribe
from a TSP? Include a screenshot below that shows the calculator results. 48
Q10. Assume that each analog line can carry 1 Erlang of voice
traffic. What is the utilization of the PSTN trunks if an Internet failure occurs
during busy hour? Show the calculation.
NETW 250 Week 6 iLab: Troubleshooting VoIP
Traffic
Examining VoIP Call Streams
Answer the following questions based on the
iLab6-Capture1.pcap file.
- Which protocol was used for the telephone to attempt to
register with the PBX?
- What is the type or name of the message or request that
is sent by the telephone to the PBX?
- The TCP or UDP port that a VoIP protocol uses must be
kept open in a firewall so that the traffic can pass through. In this same
file, what TCP or UDP port is used in Frame 1?
- The exchange between the telephone and PBX specifics a
realm they belong to. What is the name of this realm?
Answer the following questions based on the
iLab6-Capture3 file.
- In the file, SIP creates a connection between the two
telephones and RTP carries the call session itself. How many frames are
required by SIP to just setup this call?
- In the file, SIP creates a link between the two
telephones and RTP carries the call itself. How many frames are required
by SIP to just end the call?
- The RTP protocol is defined in an IETF RFC document; it
specifies how RTP operates. What is this RFC?
Answer the following questions based on the
iLab6-Capture7 file.
- The RTCP protocol appears in frame 529. What does RTCP
stand for?
- In the capture file, the RTCP protocol appears several
times. What is the function of RTCP?
- In the capture file, another protocol appears
occasionally with SIP. The frames show it as SIP/SDP. What does SDP stand
for?
NETW 250 Week 7 iLab: Unified Communications
Server Elastix: A Two-Server Scenario
Exercise 1—Testing phone calls between extensions before the interexchange
trunk configuration
Exercise 2—Configuring interexchange trunks and routes on two Elastix
servers
Task 3—Take two screenshots showing the configuration parameters of
newly created trunk ELASTIX2.The screenshots should show the same information
included in Figure 11 and Figure12
Task 4—Take a screenshot showing that route Elastix2Exts is added to
the ELASTIX_SRV1 server as demonstrated in Figure 18
Task 5—Take a screenshot showing the configuration parameters of route
Elastix2Exts on server ELASTIX_SRV1 as demonstrated in Figure 17.
Task 6—Take a screenshot of the configuration page showing that trunk
ELASTIX1 (iax) is created on ELASTIX_SRV2 as demonstrated in Figure 19.
Task 7—Take two screenshots showing the configuration parameters of
newly created trunk ELASTIX1on server ELASTIX_SRV1.The screenshots should show
the same information included in Figure 20 and Figure 21
Task 8—Take a screenshot showing that route Elastix1Exts is added to
the ELASTIX_SRV2 server as demonstrated in Figure 22.
Task 9—Take a screenshot showing the configuration parameters of route
Elastix1Exts on server ELASTIX_SRV2 as demonstrated in Figure 23.
Task 10—Question: Compare and contrast SIP and IAX trunks, including
typical applications where they are used and standards they based on. Cite
references and sources used in this research.
Exercise 3—Testing phone calls between interexchange extensions after the
trunk configuration
Task 11—Take a screenshot of softphones 101 and 204 showing the call is
coming through as demonstrated in Figure 24.
Task 12—Take a screenshot of softphones 102 and 203 showing the call is
coming through as demonstrated in Figure 25.
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