Internet Telephony Service Provider

Here you will find answers to CVoice – Internet Telephony Service Provider Questions

Question 1

You work as a network technician , study the exhibit carefully. The Acme Corp. uses H.323 to place calls to their supplier RR Industries. Acme also has a voice connection to an ITSP for long distance over a SIP network. Which configuration should Acme use to deploy the CUBE?

A.

service voice voip

allow-connections h323 to h323

allow-connections h323 to sip

allow-connections sip to sip

allow-connections sip to h323

B.

service voice voip

allow-connections h323 to h323

allow-connections h323 to sip

C.

voice service voip

allow-connections h323 to h323

allow-connections h323 to sip

allow-connections sip to h323

D.

voice service voip

allow-connections h323 to h323

allow-connections h323 to sip

Answer: C

Explanation

The Acme Corp connects to the ITSP via SIP Trunk and connects to RR industries via H.323. The Acme Corp itself uses H.323 so we have to enable protocol interworking with allow-connections commands:

allow-connections h323 to h323: allow Acme Corp to communicate with RR industries (in both ways)

allow-connections h323 to sip: allow Acme Corp to talk with ITSP (Acme Corp can talk and ITSP can hear but not vice versa)

allow-connections sip to h323: allow ITSP to talk with Acme Corp (Acme Corp can hear and ITSP can talk but not vice versa)

Notice that the configuration for H.323 and SIP interworking is unidirectional, thus if bidirectional interworking is required, you need to configure the mirror-matching statement as well.

Acme Corp doesn’t use SIP so we don’t need to configure “allow-connections sip to sip”.

Question 2

H.323 is an umbrella Recommendation from the ITU Telecommunication Standardization Sector (ITU-T) that defines the protocols to provide audio-visual communication sessions on any packet network. Which CUBE configuration will support H.323 protocol interworking and address hiding?

A.

voice services voip

h323 interworking

media flow-around

B.

voice services h323 to h323

h323 interworking

media flow-through

C.

voice services voip

allow-connections h323 to h323

media flow-around

D.

voice service voip

allow-connections h323 to h323

Answer: D

Explanation

Address hiding is a security feature of the CUBE which will hide the IP address of the originating gateway. This feature is turn on by default so we don’t need to set it.

A and B are not correct because the command “h323 interworking” doesn’t exist (moreover A uses “media flow-around” feature which will turn off the address hiding feature).

C is not correct because it uses “media flow-around” feature too.

Question 3

Refer to the exhibit. The Acme Corp. is deploying a CUBE. As a component of protocol interworking between RR Industries and the ITSP, they need to configure at least two dial peers. When the IP WAN is functional, Acme Corp. wants to use 5-digit dialing to RR Industries. Which three dial peers will complete the configuration for Acme Corp.? (Choose three)

A. dial-peer voice 50 voip
destination-pattern 50…
session protocol sipv2
session-target ipv4:192.168.100.100

B. dial-peer voice 1000 voip
destination-pattern 51…
session-target ipv4:192.168.100.100

C. dial-peer voice 91 voip
session protocol sipv2
destination-pattern 91T
session-target ipv4:10.1.100.1
dtmf-relay rtp-nte digit-drop h245-alphanumeric

D. dial-peer voice 91 voip
destination-pattern 91T
session-target ipv4:10.1.100.1
dtmf-relay rtp-nte digit-drop h245-alphanumeric

E. dial-peer voice 1000 voip
destination-pattern 51…
session-target ipv4:10.1.100.1

F. dial-peer voice 50 voip
destination-pattern 50…
session-target ipv4:172.16.14.6

Answer: B C F