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119 Cards in this Set
- Front
- Back
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When using an inline power enabled Catalyst switch, which pins are used to supply power
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1, 2, 3, 6
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When using a Cisco Inline patch panel, Which pins are used to supply inline power
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4, 5, 7, 8
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What Protocol is used to determine the Vlan ID of the Voice traffic
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CDP
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What mailstore option is supported in Unity 2.4.6
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Exchange 5.5
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What attributes will be stored in the Active Directory Using unity 3.0 and Exchange 2000
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Location ID
Alternate Extension Recorded Name |
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What network managemet Server applications can be used to monitor voice quality by polling the SNMP MIB for MQC
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Inter-network Performance Monitor
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A phone will mark voice and signal packets with what dscp values. These values will remain unchanged unless match and marked again
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DSCP EF for Voice
DSCP EF 31 for signaling |
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What Protocol does a phone use to learn the IP address of its TFTP server
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DHCP
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What is Jitter? And how is it compensated for?
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Jitter is the variation for the time that a packet is expected to be received and when it is actually received. Voice Devices have to compensate for this by having a Playout buffer
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What are the differences between TOS and COS
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COS is a class based Layer Two device.
TOS has the ability to prioritize access to media via the Prescence Bit. TOS is a layer 3 Mechanism |
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When using MGCP where does the ISDN signaling occur
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On the link between the PSTN and the Voice Gateway.
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What Does MGCP backhaul mean?
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Transporting Q.931 Message to the MGCP Call Agent Across IP.
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What are two ways to protect a branch office when the WAN fails.
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MGCP Fallback, and SRST
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If a phone falls into CM fallback service, what are two reasons why
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The fast ethernet port on the HQ Gateway is bad.
Something has happened to the TCP stream between Call Manager and the Gateway. |
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In a digram where we see an mgcp gatewat and a phone, between what two devices will we see SCCP
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Between the Phone and the CM. MGCP protocol between the CM and the Gateway
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What determines the maximum weight capacity of a cisco MCS server
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CCM Software Release version
The amount of memory CPU and I/O Throughput The server Model and Type. |
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A IP phone tries to connect to an analog phone across the PSTN through the HQ gateway. The PSTN returns an Unknown Error. What can you do to rectify this issue
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Implement an outgoing translation rule on the VOIP dialpeer on the HQ GW
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Migrating from TDM to VOIP usually does not cause migration issues for customers who expect to be deploying?
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In a green field scenario
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What type of configuration for a gateway would allow the PSTN to pass caller ID through the gatweay?
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H.323 to the callmanager. Because you are backhauling the q.931
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In a situation where you need to ensure that calling card users are not charge unless the calling party actually answer, what would you do on an FXO port
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Configure Call progress tone detection on the FXO interface to indicate answer supervision.
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If you want to have caller id in both directions for phones on a VOIP network and on the PSTN, what configuration do you need to have?
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FXS, EM, FXO provided the FXo support caller id
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What type of signaling can provide automatic number identification (ANI) on a T1/E1 Line
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E&M FGD
PRI |
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If the PBX does not recieve thhe first few digitis from the IP side of a 2611 network, what can you do?
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Configure delay-dial under the voice-port to add the delay.
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What is the best configuration on the WAN edge for QOS
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Match EF - Voice Traffic
Match AF31 - Signaling Voice to priority 33 percent Signalling to 2 percent The Rest Fair Queue |
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If you have a PBX/PSTN that is connected to a voice gateway, what two important things must you understand to connect the two
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If the PBX supports the User side or the Network Side
What is the switch type supported by the PBX |
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What is an attribute of ISDN Non Facility Associated signaling NFAS
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Single D channel controls b channels on the same T1 span as well as other T1 Spans
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What is one specific Thing about CAMA signaling
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It is used specifially for 911 calls
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How much layer 3 bandwidth is required for call control on average
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8 bps
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Supplementary services for echo in ISDN
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G.165
G.168 |
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Queing at the Edge gateway should be
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LLQ, CBWFQ, WFQ
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What Protocol does h255 use to setup a connection between 2 h323 gateways.
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Q.931
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What are the two most important functions of H245
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It allows both sides of the call to perform IP address exchanage and UDP port negotiations
It allows codec Negotiations Between calling parties |
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TCP recieves a request to open port 1720 in a voip network. for what purpose will the port be allocated for?
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H.245 Capabilities exchange negotiation
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What is considered a node in an H.323 network. (Choose 3)
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Proxy
Gateway Gatekeeper All of the above (x) |
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What is the sampaling Rate used by Nyquists Therom
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8,000 Kbps
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What happens when you use LLQ feature of the Cisco IOS
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RTP Traffic is service by the PQ
Data Traffic is service by the CBWFQ |
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G711 Payload is how big
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160 Bytes
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IP UDP and RTP Header is how big?
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40 Bytes
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What percentage of a G711 payload is IP, RTP and UDp
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25% 40/160
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What is the command to enable CRTP
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ip rtp header-compression
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What field in the Show Active Voice command will identify that packet loss is occuring
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The Receive Delay Field
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What is the default Fax Relay connection Rate
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7200 BPS
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What Can AAA Be used for
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Authentication
Admission Security |
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What is the correct configuration for using AAA for VOIP authentication
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aaa new-model
aaa authentication login voip radius |
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What is the busy hour voice traffic based on in a call center deployment
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Queue Time
Agent Talk Time |
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What Three Elements make up the MQC?
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Class-map
Plolicy Map Service Policy |
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What is not a primary cause of echo in a voice network?
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Packet Loss in the IP Network.
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How is 1 Erlang Calculated
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(BCHA * AHT) / 3600 or /60
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What is the purpose of the Erlang-C Traffic Model in an IP ocntact center
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To Provision Agents to handle Inbound calls.
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In Terms of echo.. True or false ERL stands to measure the amount of echo heard by the user?
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False
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What command will produce detailed information about the codec, ERL, TX and RX and dial peers
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Show call active voice
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What is the traffic model typicall used when dimensioning call center agents recieve calls from infinite sources where calls are queued during the busy hour
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Erlang c
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A voice gatewat is receiving calls form infinite sources. During the busy hours lost calls should be blocked. Which traffic model is this
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Erlang B
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What would cause you to hear echoes of your own voice
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Mismatch in impedance in the hybrid transformer
Gain in the local loop ERL is low at the trail circuit |
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What weight are packes in the PQ given when PQ-WFW is configured on an interface
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0
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What part of the voice path represent the tail circuit
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the point beween the far end phone and the gateway
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What is the typical bandwidth including layer 2 for a single g.729 call
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32 kpbs
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What is the range of UDP ports used in Cisco's VOIP implementation
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16384 to 32767
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How does a h.323 proxy Gatekeeper Request Registration (GRQ) and RAS message get snet by which endpoints (choose three)
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Proxy
Gateway H.323 Terminal |
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What is the target overall loss plan across a telephone network
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4dbm - 12 dbm
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What is a gatekeeper? (Choose 2)
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An optional componenet which provides call control to h.323 enpoints
Logically seperate but can be physically implemented within a terminal |
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What set of commands will guarantee a maximum serialization delay of 15ms on a circuit
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ppp multilink fragment-delay 15
ppp multilink interleave |
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What is not performed by the h.323 gatekeepr
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Codec Negotiation
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What Type of signaling provides DNIS information
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E&M
Ground Start Loop Start All of the above |
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What is a DPA adaptor used for
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To connect an OCtel 200/300/250/350 to call manager
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Where can the gatekeeper be when gateways are registering with a gatekeepr
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Any option
In a different Subnet On a remote LAN On the same subnet On the same LAN |
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What three protocols will allow a call manager to interface with a pbx system
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MGCP
QSIG PRI NI-2 |
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What is the advantage of an SRST Desgin
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It enhances the availability of a centeralized call processing
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What call processing functions does SrST provide. Choose two
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Ip to GW calls
IP to IP calls |
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In order for SRST to funciton properly, What two physical connections must be duplicated when used wiht HSRP
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PSTN
LAN |
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A user complaines about echo on a call. The ERL has determined to be 15. The T1 is configured as follows.
Voice-Port 1/0:15 Echo-cancel coverage. What can be done to resolve the problem |
Increase the echo tail coverage
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What combination will give the best video quality using a 128 kbps conf cass
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G.728 and H.263
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A user is complaining about echo from a pstn in an ip nextwork. What can be done to solve this
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Increase the Echo Cancellaiton of the HQ-GW
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What criteria does a Cisco SIP Proxy server use to make routing decisions
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User-Portion on the Request - URI
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What can a SIP Proxy not perform?
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User Agent
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What is the order in which CSPS will determine how to route a packet when processing a single SIP message
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Registry, GKTMP, Static Route, LRQ to H.323 Gatekeeper
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What SIP header a SIP proxy is allowed to change
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The Request URI
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What does MD0010013D 0002215 represent
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Extension 2215 is calling into VM port 13
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If two phones 1500 and 1501 wanted to call each other, what is the minimum configuration that will allow them to talk
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Being in the same partition
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When is it possible for two unity servers to be placed in the same dialing domain
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When they are attached to the same PBX
When the subscribers don't have overlapping extensions |
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When using a 4 wire E and M line you notice that the all the calls are failing. What would you short out to see if oyu get dial tone
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Short the E Pin to ground.
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What does an ICM do upon recieving a call
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Identifies and selects and availialbe agent,
Maps the dialed number to the call type and maps it back to the routing agent |
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What happens when changes are made to the CCMAdmin page of a subscriber
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The changes are made in the publisher and then replicated to subscribers
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What two things does intercluster communications signaling include in a call manager cluster
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Locations bandwidth and shared media resources.
Registration of Devices. |
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What does call manager use the concept of location sfor
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To define the bandwidth that can be used between two devices
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What is the difference between a route-group and a route-list
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Route Lists contain route groups which point to gateways
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Why is PRi the best method to conntect a Call Manager to an existsing PBX
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It is the most cost effective
It offers the highest level of interoperability |
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Transfer Types from AMIS to Email-server
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Voice Mail Message
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Amis is used to?
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Send Voice Mail messages.
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What device does a cisco unity TSP look and behave most like
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A Tapi Device
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You want to trouble shoot a fail safe issue in Unity. Where do you look at the traces
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The Applicaiton Log
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what protocol do Call Managers use for integration to voice mail
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SMDI
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What types of Devices Can produce SMDI packets
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A Cisco Unity
A Cisco Call Manager A Cisco Vg 248 Analog phone |
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What SMDI Message from Call Manager CMI or VG 248 allows a voice mail system to provide a heartbeat function on a rs232 serial Link
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OP:mwi
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What factor determines the fragmentation size on a t1/e1 frame relay circuit
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Line Speed
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What is the correct interperation of the following SMDI Packt
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Look for MD and A
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A pc is sending frames into an access switch
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Sending voice fames so its makred. COS 5 and vlan 112
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What percentage of a standard g729a packet is taken by ip udp and rtp
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66 percent == 40(rtpudpIP) + 24 audio codec = 64… 40/64
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What IOS feature can Synthesize voice packets and measure latency jiteer and loss stats
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Service Assurance Agent
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"Even if there are two class maps defined with priority, 100 and 50. What is the total amount of priority bandwidth"
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150 KBPS voice priority bandwidth
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What command will guarantee a maximum serialization delay on a 10 ms converged 256 kps frame relay circuit
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Frame-relay fragment 320
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Class of service is a
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Method of calssifing different traffic flows into a category and applying a particualr QOS for that flow
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Low speed atm carries both voice and data. What is the most appropriate TX ring
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3
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What is the total acceptable dealy on a one way circuit
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0 to 150 ms
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When PQ-wfw is enabled. The PQ packets are given a weight of
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0
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What are the three parts of the MQC
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"Class-Map, Policy-Map, Service Policy"
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Jitter buffer is used for
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Concealing Variable Interframe gaps
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"A call setup between an ip phone, a voice gateway and the pbx using MGCP. Where do we see RTP traffic"
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Between the phone and the voice gateway
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What best describes PCM
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Nyquist twice. Sampaling at 8kps twice that of the sound of voice
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When using TCP a port at 1720 is setup. This port is used for
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H245 capability exchange
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A method for touche-tone phones in which each digit corresponds to one of 16 combinations of pairs of sine waves chosen from 8 diferent frequencies
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Dual Tone Multifrequeny tone detection
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"If a voice gateway is using MGCP and with call manager, where will we see Q931"
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"Between the PSTN and the Gateway, and the Gateway and the CUCM"
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H323 RAS messages are sent using
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UDP/IP
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In general Fax relay is
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Less tolerant than voice to packet loss
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A commonly used instance of ADPCM wich encodes using 4 bit samples with a transmission rate of 32 kpbs is
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g.726
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What is considered a node in h323
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"Gateway, Gatekeeper, Proxy, All"
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The standard for sending voice and fax over frame relay
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FRF 11
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RTP Provides
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"Payload header and content identificaiton, Sequencing number, Simple time-stamp & reconstruction"
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"The IOS GW's support ECMA QSIG. CM, MGCP is call agent modet support. What does this mean for phone world"
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"None as long as GW remains in contact with CM, During MGCP fallback, calls attached to PBX qsig will work."
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