Configuring Transcoding and Conferencing support

Today, we will configure a Transcoding and Conferencing support for our CUCM and Voice Gateway (e.g Cisco IOS Router)

First of all, if we want to add conference bridge or transcoder to Cisco Unified Call Manager, SCCP should be configured on CCME. Most common example for Transcoding and Conferencing is a Multi-site deployment over WAN. In such deployment there is certain kind of processes: 1) Transcoding between central office and remote site - converting G.711 to G.729 (which greatly decrease bandwith consumption), 2) Conferencing between central office and remote site - allowing 3 or more participants in one call.

Lets begin our configuration. In our deployment we have CUCM - 8.5 ( IP - 192.168.50.100) and two CCME: first CCME (IP - 192.168.50.1) is located in central office, second is located in remote office (IP - 10.10.20.1)

First step is to install DSP resources in Voice Gateways (You can find lots of information about models and PVDMs on cisco.com)

After installation we can check our dsp, using


show voice dsp

DSP  DSP                DSPWARE CURR  BOOT                         PAK     TX/RX
TYPE NUM CH CODEC       VERSION STATE STATE   RST AI VOICEPORT TS ABORT  PACK COUNT
==== === == ======== ========== ===== ======= === == ========= == ===== ============

Than we should configure a dsp farm (Resourses for transcoding and conferencing)

Both Voice Gateways:

voice card 0
dsp services dspfarm

After we've enabled service, a dsp farm profile should be configured (Each profile should be associated with one process - e.g  transcoding or conferencing)

Central office Voice Gateway (Transcoding)

dspfarm profile 1 transcode
codec g711alaw
codec g711ulaw
codec g729abr8
codec g729ar8
maximum sessions 8  ---- maximum number of sessions of certain dspfarm profile
associate application SCCP
no shutdown

Remote office Voice Gateway (Conferencing)


dspfarm profile 1 conference
codec g711alaw
codec g711ulaw
codec g729abr8
codec g729ar8
maximum sessions 2  ---- maximum number of sessions of certain dspfarm profile
associate application SCCP
no shutdown

Next step is to configure sccp support on our routers, associate dspfarm profile and add CUCM to sccp configuration.

Central office Voice Gateway (Transcoding)

sccp local GigabitEthernet 0/0
sccp ccm 192.168.50.100 identifier 1 priority 1
sccp
sccp ccm group 10
bind interface GigabitEthernet 0/0
associate ccm 1 priority 1
associate profile 1


Remote office Voice Gateway (Conferencing)


sccp local GigabitEthernet 0/0
sccp ccm 192.168.50.100 identifier 1 priority 1
sccp
sccp ccm group 10
bind interface GigabitEthernet 0/0
associate ccm 1 priority 1
associate profile 1

That's all on IOS Voice Gateway side. Let's switch to CUCM 8.5. First to configure Conferencing:

Go to Media Resources - Conferencing bridge. Select bridge type  - Enchanced Conference Bridge (For PVDM2 and PVDM3 Gateways's), then choose device name, device pool, location and security profile.

To configure Transcoding:

Go to Media Resources - Transcoder. Select transcoder type  - Enchanced  Media Termination Point, then choose device name, device pool.

That's all.

To verify dsp farm profile use following command:

show dspfarm profile
show dspfarm dsp all