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Number of devices limit?

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Is there a hard limit on the number of devices a single application can deal with? I.e. is there a hard-coded limit in the JTAPI library or the CUCM software or does it just depend on the memory/CPU resources available?
 

CUCM doesn't enforce any limit but applications are expected to be within the limited mentioned in scalability improvements slides at http://developer.cisco.com/web/jtapi/docs. 
 
Look for 

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Unified CM 7.1(2) CTI Scalability Improvements.ppt and Unified CM 8.6.x CTI Improvements.pptx in the above link.
 
http://tools.cisco.com/cucst (CUCM SNRD) should help as well.
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That was exactly the answer I was looking for. Thank you.