[Free] 2017(Oct) Dumps4cert Testinsides Cisco 400-051 Dumps with VCE and PDF Download 381-390

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CCIE Collaboration (v1.1)

Question No: 381 – (Topic 3)

Which H.245 information is exchanged within H.225 messages in H.323 Fast Connect?

  1. Terminal Capability Set

  2. Open Logical Channel

  3. Master-Slave Determination

  4. Call Setup

  5. Call Progress

Answer: B Explanation:

With the standard H.245 negotiation, the two endpoints need three round-trips before they agree on the parameters of the audio/video channels (1. master/slave voting, 2. terminal capability set exchange, and finally, 3. opening the logical channels). In certain situations and especially with high-latency network links, this can last too long and users will notice the delay.

Question No: 382 – (Topic 3)

Refer to the exhibit.

Dumps4Cert 2017 PDF and VCE

Which SIP message header is used to tunnel QSIG messages across the SIP network when the OGW receives a call bound for the TGW?

  1. Content-TypE. application/sdp

  2. Content-TypE. application/qsig

  3. Content-TypE. message/ISUP

  4. Content-TypE. message/external-body

  5. Content-TypE. application/x-q931

Answer: B Explanation:

Tunneling over SIP

The Cisco gateway receives QSIG messages from the PBX side and then identifies the destination of the message (or call). The QSIG messages received from the PBX are encapsulated within SIP messages as Multipurpose Internet Mail Extensions (MIME) bodies and are sent (tunneled) across the IP network to the recipient gateway.

When encapsulating a QSIG message (for switch type primary-qsig) inside a SIP message, Cisco gateways include the QSIG message in a MIME body of the SIP request or response using media type

->application/QSIG:

->Content-Type: application/QSIG

Reference:

http://www.cisco.com/c/en/us/solutions/collateral/enterprise-networks/empowered-branch- solution/white_paper_c11_459092.html

Question No: 383 – (Topic 3)

Refer to the exhibit.

Dumps4Cert 2017 PDF and VCE

Which SIP trunk deployment model is shown in this enterprise VoIP topology?

  1. mixed TDM and VoIP

  2. centralized

  3. hybrid

  4. traditional TDM

  5. distributed

Answer: C Explanation:

Hybrid SIP Trunk Model In a hybrid SIP trunk deployment, some of the businesses’ sites conform to a distributed SIP trunk deployment model. In this model each site has direct SIP session connectivity to the IP PSTN, and other sites conform to a centralized SIP trunk deployment, accessing the IP PSTN through a central hub, which has SIP session connectivity to the IP PSTN (Figure 3). The hybrid SIP trunk deployment model may have multiple “central” hubs in different geographic regions, or for specific business functions, such as call centers.

Figure 3 Hybrid SIP Trunk Deployment Mode

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Reference: http://www.cisco.com/c/dam/en/us/products/collateral/unified-

communications/unified-border-element/cis_45835_cube_assets_wp1e.pdf

Question No: 384 – (Topic 3)

Refer to the exhibit.

Dumps4Cert 2017 PDF and VCE

How many SIP signaling dialog(s) took place in this SIP message exchange between two SIP user agents?

  1. 1

  2. 2

  3. 3

  4. 4

  5. 5

  6. 6

Answer: A Explanation:

During the establishment, maintenance and termination of a SIP session, signaling messages are exchanged between the two SIP endpoints. There are two different kinds of signaling “conversations” that those messages take part in: transactions and dialogs.

A transaction is a SIP message exchange between two user-agents that starts with a request and ends with its final response (it can also contain zero or more provisional responses in between). For example, during the termination of a SIP session, one user releases the call by sending a BYE request and the other party replies back with a 200 OK response. This message exchange is called a transaction.

But what happens in the case of the INVITE request? The establishment of a SIP session starts basically with an INVITE request and is considered as completed upon the receipt of the ACK. In this case, the transaction starts with the INVITE request and ends with the 200 OK, so the ACK is not part of the transaction. The ACK can be considered as a transaction on its own. However, when the final response to an INVITE is not a 2xx response, then the ACK is considered as part of the transaction. A dialog is a complete exchange of SIP messages between two user-agents. That means that transactions are actually parts of a dialog. For example, in the case of a SIP session establishment, a dialog starts with the INVITE-200 OK transaction, continues with the ACK and ends with the BYE-200 OK transaction.

The picture below depicts the dialog and transactions that take place during the establishment of a SIP session:

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Note: There can also be subsequent requests that belong to the same dialog, such as a BYE or a re-INVITE message. As out-of-dialog requests are considered messages such as an initial INVITE request for a new session or an OPTIONS message for checking capabilities.

There are different SIP headers/parameters that identify the dialogs and transactions, and they will be analyzed in later posts.

Reference: https://telconotes.wordpress.com/2013/03/13/sip-transactions-vs-dialogs/

Question No: 385 – (Topic 3)

Refer to the exhibit.

Dumps4Cert 2017 PDF and VCE

A user is going through a series of dialing steps on an SCCP IP phone (extension 1001) to call another SCCP IP phone (extension 2003). Both phones are registered to the same Cisco Unified Communications Manager cluster. Which user inputs are sent from the calling IP phone to the Cisco Unified Communications Manager, in forms of SCCP messages, after the user pressed the Dial softkey? Note that the commas in answer choices below are logical separators, not part of the actual user input or SCCP messages.

  1. A separate SCCP message is sent to Cisco Unified Communications Manager for each of the following user inputs: 2, 0, 0, 3.

  2. A separate SCCP message is sent to Cisco Unified Communications Manager for each of the following user inputs: 2, 0, 1, lt;lt;, 0, 3.

  3. A single SCCP message is sent to Cisco Unified Communications Manager to report that digits 2003 have been dialed.

  4. A single SCCP message is sent to Cisco Unified Communications Manager to report that digits 201lt;lt;03 have been dialed.

  5. A separate SCCP message is sent to Cisco Unified Communications Manager for each of the following user inputs: 2, 0, 1, lt;lt;, 2, 0, 0, 3.

Answer: C Explanation:

After the user delete phone stop the digit by digit dialing and send it as a whole setup.

Question No: 386 – (Topic 3)

Which two SCCP call signaling messages are sent by an IP phone to Cisco Unified Communications Manager? (Choose two.)

  1. SoftKeyEvent

  2. OpenReceiveChannelAck

  3. StartMediaTransmission

  4. SelectSoftKeys

  5. CloseReceiveChannel

  6. StopTone

Answer: A,B Explanation:

This message indicates which soft key was pressed. Upon receipt of this message, CallManager invokes the action associated with the pressed soft key. For example, if Hold was the pressed soft key, CallManager places the active call on user hold. In some trace files you might see a soft key number without the corresponding description. The following list defines each soft key number.

Question No: 387 – (Topic 3)

What is the minimum number of TCP sessions needed to complete a H.323 call between two H.323 gateways using slow start?

  1. 0

  2. 1

  3. 2

  4. 3

  5. 4

Answer: C Explanation:

H.323 has two modes of operation: slow start and fast start. The initiation of a call may proceed in a slow start or fast start in H.323. In a slow start, H.323 signaling consists of Setup, Call Proceeding, Alerting, and Connect steps. After these steps, the H.245 media negotiation is performed. When a call is initiated in H.323 fast start, the H.245 media negotiation is performed within the initial Setup message. With slow start, multiple TCP connections are needed for an H.323 call, such as one H.225 signaling channel and one

H.245 signaling channel if required (minimum of these two).

Question No: 388 – (Topic 3)

Which statement about G.722.1 codec support on Cisco Unified Communications Manager is true?

  1. It is always preferred by Cisco Unified Communications Manager over G.711.

  2. It is a high-complexity wideband codec.

  3. It operates at bit rates of 15.2 and 13.3 kb/s.

  4. It is supported for SIP and SCCP devices.

  5. It is supported for SIP and H.323 devices.

Answer: E Explanation:

G.722.1 is a low-complexity wideband codec operating at 24 and 32 kb/s. The audio quality approaches that of G.722 while using at most half the bit rate. As it is optimized for both speech and music, G.722.1 has slightly lower speech quality than the speech-optimized iSAC codec. G.722.1 is supported for SIP and H.323 devices.

Question No: 389 – (Topic 3)

Refer to the exhibit.

Dumps4Cert 2017 PDF and VCE

You received this debug output to troubleshoot a Cisco IOS MGCP gateway media-related problem at a customer site. What is the purpose of this message?

  1. The MGCP gateway is responding to an RQNT message from Cisco Unified Communications Manager to poll the media capabilities on its endpoints.

  2. The MGCP gateway is responding to an AUEP message from Cisco Unified Communications Manager to poll the media capabilities on its endpoints.

  3. The MGCP gateway is responding to an AUCX message from Cisco Unified Communications Manager to poll the active calls on its endpoints.

  4. The MGCP gateway is responding to an MDCX message from Cisco Unified Communications Manager during a call setup.

  5. The MGCP gateway is responding to a CRCX message from Cisco Unified

Communications Manager during a call setup.

Answer: D Explanation:

See MGCP packet debugging examples and their meanings at the Reference link below.

Reference: Sample of Debug MGCP Packets

http://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified- communications-manager-callmanager/42104-debug-mgcp.html

Question No: 390 – (Topic 3)

When a Cisco IOS gatekeeper receives an ARQ from a registered endpoint, what is the first step it will take in an attempt to resolve the destination address?

  1. Check to see if the destination address is locally registered.

  2. Check to see if the destination address matches the technology prefix.

  3. Check to see if the destination address matches the local zone prefix.

  4. Check to see if the destination address matches the remote zone prefix.

  5. Check to see if the destination address matches the default technology prefix.

Answer: B Explanation:

Admission Request (ARQ) and Location Request (LRQ) are the two H.225 Registration, Admission, Status (RAS) messages that trigger a gatekeeper to initiate the call routing decision process.

->ARQ-Local zone messages that are sent by H.323 endpoints (usually gateways)

to the Cisco gatekeeper. Gatekeepers receive ARQs from an endpoint if.

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