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Cisco Bug: CSCvh95304 - Clarification on 'CTI Request Timer' on Service Parameter Help Page

Last Modified

Feb 07, 2019

Products (6)

  • Cisco Unified Communications Manager (CallManager)
  • Cisco Unity Connection Version 11.x
  • Cisco Unified Communications Manager Version 11.5
  • Cisco Unified Communications Manager Version 11.0
  • Cisco Unified Communications Manager Session Management Edition
  • Cisco Paging Server

Known Affected Releases


Description (partial)

Clarification on 'CTI Request Timer' on Service Parameter Help Page.

Current description of 'CTI Request Timer' :  CTI Request Timer: Required Field. This parameter specifies the maximum time that CTI will wait for call processing requests from applications to complete. If CTIManager does not receive this response from CallManager within the specified time, a failure response gets reported to the application. Use a higher value when you expect the requests to take longer due to heavy load on the system, when there is a failover/failback, and when you are using a machine with a slower CPU. Use a lower value when the applications cannot wait long enough to receive the successful or failure responses.
  	This is a required field.
  	Default: 5
  	Minimum:  2
  	Maximum:  300
  	Unit: sec

In the CUCM help page, the description of ?CTI Login Request Timer? looks proper because this is for the entire span of time, from application open to the point of time the application receives the device line information of all the devices/profiles under the application user control list .
However, the description of ?CTI Request Timer? should take in to account of the application timer sent during ProviderOpenRequest. If the timer sent during ProviderOpenRequest is greater than the Max CTI Request timer(300) or equal to 0, then the timer value will be set to 'CTI Request Timer', else the value passed from the Application will be used. Please note that this happens only during the ProviderOpenRequest message.
For authentication, CTI uses an internal timer which has a minimum value of 10 secs coded. However, if the CTI Request Timer value configured is higher than 10 secs, then timer is triggered with higher value .
The 'CTI Request Timer' value is used for any other request (like CtiLineinitiateCallReq, CtiRedirectReq etc..).
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