Cisco CRS-1 - Carrier Routing System Router User Manual

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Cisco Customer Response Solutions Administration Guide, Release 4.1(1)
Chapter 3 Provisioning Telephony and Media
About CRS Telephony and Media
Provisioning Channels to Handle Calls
CRS needs two types of channels to process calls:
• A call control channel, which is provisioned through the JTAPI subsystem
and corresponds to CTI port resources in the Call Manager.
• A media channel, which is provisioned through either the CMT subsystem or
the MRCP subsystem and corresponds to the kernel resources for handling
the media voice path with the caller.
Note MRCP channels also correspond to additional resources on the MRCP
server for performing speech recognition.
CRS needs access to a channel of each type in order to successfully process a call.
However, the capabilities of the two channel types are not identical.
For example, consider a CRS system provisioned with a single JTAPI call control
channel (that is, a CTI port) and a single CMT channel. The system can handle
one call at a time; when that call terminates, the system must reinitialize the
channel resources before it can accept another call.
However, the time each channel takes to reinitialize is not equal—CMT channels
take more time to reinitialize then CTI ports. For example:
• The JTAPI call control channel may take approximately 1 millisecond to
reinitialize
• The CMT channel may take approximately 200 milliseconds to reinitialize.
This example implies that the system will not be able to accept a new incoming
call for 200 milliseconds after the first call terminates; although the JTAPI
channel is available after one millisecond, the CMT channel is not and CRS needs
both channels to process a call.
Such a delay can become an issue when a CRS system is experiencing a high load
condition or needs to handle a burst of incoming calls. Consequently, CMT
channels require a higher channel count provisioning.
Tip To provision CRS systems to handle burst calls equally among all required
resources, you must configure approximately 10% more CMT channels than CTI
ports, and approximately 10% more MRCP channels than ASR licenses.

Cisco CRS-1 - Carrier Routing System Router Specifications

General

Brand	Cisco
Model	CRS-1 - Carrier Routing System Router
Category	Network Router
Language	English