Hardware Conferencing With Config ..

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Hardware Conferencing with PVDM Module on 2801

Call Manager Express

A PVDM (Packet Voice DSP Module) is a router hardware module that looks like a computer memory chip and is

used to provide Digital Signal Processing voice services to routers working as voice gateways or as Call Manager

Express devices. The high-density PVDM2 module enables Integrated services routers (such as 2800, 3800 models) to

provide high-density voice services such as transcoding, hardware conferencing and voice encoding in IP

communications solutions.

The following configuration example is about a cisco 2801 router working as Call Manager Express version 4.1 with

both local IP phones and IP Phones located in remote branches over IPSEC VPN. The remote phones work with

G729 codec and the local phones use normal G711 voice encoding. The requirement is to enable hardware ad-hoc

conferencing between remote G729 and local G711 phones.

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ware Conferencing with PVDM Module on 2801 Call Manager Expre... http://www.networkstraining.com/hardware-conferencing-with-pv

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Here is the configuration snapshot (only commands related to hardware conferencing are shown):

voice-card 0

dsp services dspfarm

!voice class custom-cptone leavetone

dualtone conferencefrequency 400 800cadence 400 50 200 50 200 50

!voice class custom-cptone jointone

dualtone conferencefrequency 600 900

cadence 300 150 300 100 300 50

!interface FastEthernet0/0ip address 192.168.10.1 255.255.255.0

sccp local FastEthernet0/0

sccp ccm 192.168.10.1 identifier 100 priority 1 version 4.1sccp

!sccp ccm group 2

bind interface FastEthernet0/0associate ccm 100 priority 1

associate profile 2 register DSPprofile2keepalive retries 5!

dspfarm profile 2 conference

! Configure codecs allowed to participate in conference

codec g711ulawcodec g711alaw

codec g729ar8

codec g729abr8codec g729r8codec g729br8

maximum sessions 2

conference-join custom-cptone jointoneconference-leave custom-cptone leavetone

associate application SCCP

telephony-service

sdspfarm units 2sdspfarm tag 2 DSPprofile2

conference hardwaremax-ephones 24max-dn 48

ip source-address 192.168.10.1 port 2000 strict-match

max-conferences 4 gain -6

!ephone-dn 43 dual-line

number A000

description Ad-Hoc Conference

conference ad-hocno huntstop!


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!

ephone-dn 44 dual-line

number A000

description Ad-Hoc Conferenceconference ad-hoc

preference 1

no huntstop!!

ephone-dn 45 dual-linenumber A000description Ad-Hoc Conference

conference ad-hoc

preference 2!

!ephone-dn 46 dual-line

number A000description Ad-Hoc Conference

conference ad-hoc

preference 3

Notice on the configuration above that we have to create some dummy phone directory numbers (ephone-dn 43 to

46) to facilitate the ad-hoc conference operation. An Ad-hoc conference is an unscheduled conference. It occurs

when a third party is added into any conversation by the participants. The ad-hoc initiators can add/delete/drop

participants to/from the conference.

CME hardware conferencing supports a maximum of 8 participants in an ad-hoc conference.

Each DSP can support a maximum of 64 G.711 participants only (single-mode), this translates to:

8 conferences of 8 participants each.

Each DSP can support a maximum of 16 G.711/G.729A/G.729 participants (mixed-mode), so this translates to:

2 conferences of 8 participants each.

Verify DSP registration

If your DSPfarm is not registered to CME, you will not be able to use the DSP resources to initiate a conference call.

To check if the dspfarm is registered, perform the following command – “show dspfarm all”

Example: Registered – good example

Router#show dspfarm all

<output omitted>

Profile Operation State : ACTIVE

Application : SCCP Status : ASSOCIATED

<output omitted>

Example: Unregistered – bad example

<output omitted>

Profile Operation State : ACTIVE I PROGRESS


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Application : SCCP Status : ASSOCIATIO I PROGRESS

<output omitted>

Related posts:

Basic IP Phone Configuration on Cisco Call Manager Express1.

Call Manager Express CME Deployment Scenarios2.How To Install Cisco Call Manager Express CME Software3.

SIP Trunking With Call Manager Express4.

Connecting two Cisco Unified Communication Manager Express with H3235.

Cisco CallManager Express Deployment Topologies6.

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