1

What is the purpose of a DSPFarm Profile?

Answer:

The DSPFarm profile allows the DSPs of a gateway to be registered to multiple CallManager groups.

   
2

When is a DSP needed for an MTP?

Answer:

You need a DSP when the packetization period for the voice streams is not the same. If the packetization period is the same, you can use a software-based MTP.

3

What is the default codec complexity for a C5510 DSP?

Answer:

Flex complexity is the default codec complexity.

4

What is the major difference in the way C549 and C5510 DSPs handle voice termination?

Answer:

When you are using a C549 DSP, voice termination is assigned statically. Each voice port is permanently assigned to a DSP when the voice port is created. When you are using a C5510 DSP, voice termination is dynamically assigned. Sequential calls on the same voice port might be handled by different DSPs.

5

You need to terminate 14 G.711 calls, provide transcoding for 6 G.729a to G.711 calls, and support 5 G.711 conference sessions with up to eight participants in each conference. What is the minimum number of DSPs required?

Answer:

You need three C5510 DSPs. C549 DSPs support only six participants per conference. One DSP supports the voice termination for 14 calls. One DSP supports the six required medium-complexity transcoding sessions. One DSP supports up to eight G.711 conference calls.

6

You need to support one mixed-mode conference with up to eight participants. How should you configure the maximum sessions under the conference profile?

Answer:

Because a DSP that is configured for conferencing cannot support another function, you should configure the maximum sessions to 2, which is the maximum number of conferences that a C5510 DSP can support. Setting the maximum sessions to 1 eliminates the possibility of using the DSP to its full capability.

7

Describe two benefits of DSP sharing.

Answer:
  • It reduces the possibility of oversubscribing DSP resources.
  • It makes it easier to add DSP resources. DSPs can be added to an NM instead of having to dismantle the router to access the main board.
8

Your ISR 2811 has an NM-HDV with five PVDM-12s and two PVDM2-48s installed on the main board. The NM-HDV is configured for medium complexity and has one E1 voice port. There are also two E1 voice ports in HWIC slots. What is the maximum number of G.711 conferences that you can support with the extra DSPs?

   
Answer:

The five PVDM-12s have three C549 DSPs each, which can terminate four medium-complexity calls requiring that 8 of the 15 DSPs are used for voice termination. You can configure the remaining seven DSPs to support one conference bridge each.

The two PVDM2-48s have a total of six C5510 DSPs. Four of these DSPs are required to terminate the 60 voice channels in the two E1s. The remaining two C5510 DSPs can each support eight G.711 conferences, for a total of 16.

Because using both Cisco IOS Media Resources (C549) and Enhanced IOS Media Resources (C5510) is not supported on a single router, you can register only the C5510s to CallManager. Therefore, the maximum number of G.711 conferences supported is 16.


Part I: Voice Gateways and Gatekeepers

Gateways and Gatekeepers

Part II: Gateways

Media Gateway Control Protocol

H.323

Session Initiation Protocol

Circuit Options

Connecting to the PSTN

Connecting to PBXs

Connecting to an IP WAN

Dial Plans

Digit Manipulation

Influencing Path Selection

Configuring Class of Restrictions

SRST and MGCP Gateway Fallback

DSP Resources

Using Tcl Scripts and VoiceXML

Part III: Gatekeepers

Deploying Gatekeepers

Gatekeeper Configuration

Part IV: IP-to-IP Gateways

Cisco Multiservice IP-to-IP Gateway

Appendix A. Answers to Chapter-Ending Review Questions

Index



Cisco Voice Gateways and Gatekeepers
Cisco Voice Gateways and Gatekeepers
ISBN: 158705258X
EAN: 2147483647
Year: 2004
Pages: 218

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