Using Cisco Unified Communications Manager to Configure RSVP Agent
Restrictions for RSVP Agent
168
Cisco VGD 1T3 Voice Gateway Software Configuration Guide
•
The sccp ccm command must use the keyword version 5.0.1.
Cisco Unified Communications Manager
The following prequesities pertain specifically to RSVP Agent in a Cisco Unified Communications
Manager network:
•
Cisco Unified Communications Manager 5.0.1 or a later release.
•
Transcoder and MTP services must be configured in Cisco Unified Communications Manager. See
the following chapters in the Cisco Unified Communications Manager Administration Guide:
–
“Media Termination Point Configuration”
–
“Transcoder Configuration”
•
RSVP policy level must be configured in Cisco Unified Communications Manager. See the
“Service
Parameters Configuration”
chapter in the Cisco Unified Communications Manager Administration
Guide.
Restrictions for RSVP Agent
•
RSVP agent is not supported by conference devices.
•
RSVP agent is not supported by a hardware MTP or transcoder device using the NM-HDV.
•
RSVP agent is supported by a software MTP using the NM-HDV only if the dsp services dspfarm
command is not enabled for the voice card.
•
Lip-sync for video calls is not supported.
Information About RSVP Agent
Resource Reservation Protocol (RSVP) is the IP service that allows applications to request end-to-end
QoS guarantees from the network. Cisco VoIP applications use RSVP for call admission control, limiting
the accepted voice load on the IP network to guarantee the QoS levels of calls. In networks that include
both voice and video media, bandwidth requirements can vary considerably over any given time.
Cisco Unified Communications Manager ensures resource reservation for voice and video media by
using RSVP.
The RSVP agent is a transcoding or MTP device on the Cisco IOS gateway that registers with
Cisco Unified Communications Manager as RSVP-capable. The RSVP agent is controlled by
Cisco Unified Communications Manager which communicates with the RSVP agent using SCCP.
Cisco Unified Communications Manager consults its policy configuration to determine if RSVP is
required for a voice or video call. If the configured QoS level for a call is optional or mandatory, and the
RSVP agent is enabled on the voice gateway, Cisco Unified Communications Manager inserts a pair of
RSVP agents into the media path to provide RSVP support. The RSVP agent on the Cisco VGD 1T3
voice gateway creates the RSVP reservation for the two endpoints and bridges the media connection so
that resources are reserved for the media path, providing QoS for the call.
Figure 1
shows where the RSVP agent fits in a Cisco Unified Communications Manager meshed
network.
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