[Free] 2017(Oct) Dumps4cert Testinsides Cisco 400-051 Dumps with VCE and PDF Download 401-410

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CCIE Collaboration (v1.1)

Question No: 401 – (Topic 3)

Which SIP reason phrase maps to SIP response reason code 181?

  1. Ringing

  2. Call is Being Forwarded

  3. Session in Progress

  4. Unknown Number

  5. Call Does not Exist

Answer: B Explanation:

1xx-Provisional Responses

100 Trying

Extended search being performed may take a significant time so a forking proxy must send a 100 Trying response.

  1. Ringing

    Destination user agent received INVITE, and is alerting user of call.

  2. Call is Being Forwarded

    Servers can optionally send this response to indicate a call is being forwarded.[1]:搂21.1.3

  3. Queued

    Indicates that the destination was temporarily unavailable, so the server has queued the

    call until the destination is available. A server may send multiple 182 responses to update progress of the queue.

  4. Session in Progress

This response may be used to send extra information for a call which is still being set up.

199 Early Dialog Terminated

Can be used by User Agent Server to indicate to upstream SIP entities (including the User Agent Client (UAC)) that an early dialog has been terminated.

Reference: http://en.wikipedia.org/wiki/List_of_SIP_response_codes

Question No: 402 – (Topic 3)

Which two data frame lengths are supported by iLBC? (Choose two.)

  1. 10 milliseconds

  2. 20 milliseconds

  3. 30 milliseconds

  4. 40 milliseconds

  5. 50 milliseconds

  6. 60 milliseconds

Answer: B,C Explanation:

iLBC-Internet Low Bit Rate Codec (iLBC) provides audio quality between that of G.711 and G.729 at bit rates of 15.2 and 13.3 kb/s, while allowing for graceful speech quality degradation in a lossy network due to the speech frames being encoded independently. By comparison, G.729 does not handle packet loss, delay, and jitter well, due to the dependence between speech frames. iLBC is supported for SIP, SCCP, H323, and MGCP devices.

Question No: 403 – (Topic 3)

In Key Press Markup Language, which SIP request is used to deliver the actual DTMF

digits?

  1. SUBSCRIBE

  2. INFO

  3. NOTIFY

  4. INVITE

  5. ACK

Answer: C Explanation:

KPML procedures use a SIP SUBSCRIBE message to register for DTMF digits. The digits themselves are delivered in NOTIFY messages containing an XML encoded body.

Question No: 404 – (Topic 3)

Which SIP request method enables reliability of SIP 1xx response types?

  1. ACK

  2. PRACK

  3. OPTIONS

  4. CANCEL

  5. REGISTER

Answer: B Explanation:

In order to achieve reliability for provisional responses, we do nearly the same thing. Reliable provisional responses are retransmitted by the TU with an exponentialbackoff. Those retransmissions cease when a PRACK message is received. The PRACK request plays the same role as ACK, but for provisional responses. There is an important difference, however. PRACK is a normal SIP message, like BYE. As such, its own

Question No: 405 – (Topic 3)

Refer to the exhibit.

Dumps4Cert 2017 PDF and VCE

If this SIP call is initiated using delayed offer, which SIP message will UA#2 use to communicate its media capability to UA#1?

  1. INVITE

  2. 180 Ringing

  3. 200 OK

  4. ACK

  5. RTP Media

Answer: C Explanation:

200 OK Indicates the request was successful.

Question No: 406 – (Topic 3)

Refer to the exhibit.

Dumps4Cert 2017 PDF and VCE

If this SIP call is initiated using early offer, which SIP message will UA#2 use to communicate its media capability to UA#1?

  1. INVITE

  2. 180 Ringing

  3. 200 OK

  4. ACK

  5. RTP Media

Answer: C Explanation:

In Early offer, SIP Send SDP in the invite, the other node will send the SDP in the 200 message.

Question No: 407 – (Topic 3)

Which two SDP content headers can be found in a SIP INVITE message? (Choose two.)

  1. Expires

  2. Contact

  3. Connection Info

  4. Media Attributes

  5. Allow

  6. CSeq

Answer: C,D Explanation:

Connection info is optional field in SDP whether Media attributes decide the codec and media type for that call.

Question No: 408 – (Topic 3)

Refer to the exhibit.

Dumps4Cert 2017 PDF and VCE

You received this debug output to troubleshoot a Cisco IOS MGCP gateway call quality issue at a customer site. Which statement about this message is true?

  1. The MGCP gateway is responding to an RQNT message from Cisco Unified Communications Manager to poll the call statistics of an active call.

  2. The MGCP gateway is responding to an AUEP message from Cisco Unified Communications Manager to poll the call statistics of a terminating call.

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

  4. The MGCP gateway is responding to an AUCX message from Cisco Unified Communications Manager about an active call.

  5. The MGCP gateway is responding to a DLCX message from Cisco Unified Communications Manager about a terminating call.

Answer: E Explanation:

DeleteConnection – used by a call agent to instruct a gateway to delete an existing connection. DeleteConnection can also be used by a gateway to release a connection that can no longer be sustained.

Question No: 409 – (Topic 3)

How are DTMF digits transported in RFC 2833?

  1. In the RTP stream with the named telephone events payload format.

  2. In the RTP stream with the regular audio payload format.

  3. In SIP NOTIFY messages.

  4. In SIP INFO messages.

  5. In SIP SUBSCRIBE messages.

Answer: A Explanation:

DTMF digits and named telephone events are carried as part of the audio stream, and MUST use the same sequence number and time-stamp base as the regular audio channel to simplify the generation of audio waveforms at a gateway. The default clock frequency is 8,000 Hz, but the clock frequency can be redefined when assigning the dynamic payload type.

Question No: 410 – (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: E

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