Dsp Farms; Dsp Farm Profiles; Conferencing - Cisco 1941W Configuration Manual

Chapter Configuring Next-Generation High-Density PVDM3 Modules

DSP Farms

DSP Farm is enhanced to support increased transcoding and conference density. For DSPs on PVDM3
modules, existing resource allocation and management mechanisms are enhanced:
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DSP Farm Profiles

DSP-farm profiles are created to allocate DSP-farm resources. Under the profile, you select the service
type (conference, transcode, or Media Termination Point [MTP]), associate an application, and specify
service-specific parameters such as codecs and maximum number of sessions. A DSP-farm profile
allows you to group DSP resources based on the service type. Applications associated with the profile,
such as SCCP, can use the resources allocated under the profile. You can configure multiple profiles for
the same service, each of which can register with one Cisco Unified Communications Manager group.
The profile ID and service type uniquely identify a profile, allowing the profile to uniquely map to a
Cisco Unified Communications Manager group that contains a single pool of Cisco Unified
Communications Manager servers.

Conferencing

Voice conferencing involves adding several parties to a phone conversation. In a traditional
circuit-switched voice network, all voice traffic passes through a central device such as a PBX.
Conference services are provided within this central device. In contrast, IP phones normally send voice
signals directly between phones, without the need to go through a central device. Conference services,
however, require a network-based conference bridge.
In an IP telephony network using Cisco Unified Communications Manager, the Conferencing and
Transcoding for Voice Gateway Routers feature provides the conference-bridging service. Cisco Unified
Communications Manager uses a DSP farm to mix voice streams from multiple participants into a single
conference-call stream. The mixed stream is played out to all conference attendees, minus the voice of
the receiving attendee.
The Ad Hoc and Meet Me conferencing features are supported (a conference can be either of these
types):
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Participants whose end devices use different codec types are joined in a single conference; no additional
transcoding resource is needed.
Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
For the PVDM3 DSP, participant-per-conference support is expanded to a maximum of 64. Note that
this is supported only by low-complexity conference in Cisco IOS Release 15.0(1)M.
Transcoding or conferencing channel allocation for a new call is modified to achieve load balancing.
This is supported by the capability to select one channel from one DSP at a time.
Ad Hoc—The person controlling the conference presses the telephone conference button and adds
callers one by one.
Meet Me—Participants call in to a central number and are joined in a single conference.
Information About Configuring the PVDM3 Module on Cisco Voice Gateway Routers
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