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Cisco Bug: CSCvv27137 - DOC: Load-balancing-calls-across-Meeting-Servers-2-9-white-paper.pdf

Last Modified

Sep 01, 2020

Products (1)

  • Cisco Meeting Server

Known Affected Releases

2.9

Description (partial)

Symptom:
On page 30 of  Load-Balancing white paper the following is covered: 

"This redirect will occur via a second Meeting Server node sending a new INVITE message back to the CUCM. This message contains the necessary information for the CUCM to replace any existing connection to the first Meeting Server with this new connection. The user's device does not need to participate in this transfer at all."

Above section needs to be extended with a note or a second paragraph expressing the following idea:
  
"The new INVITE should match either an existing route pattern associated with a device or a dummy pattern due to documented behaviour on CUCM, see defect CSCve57632.
This pattern match won't be used to route the call, only to continue with replaces operations. 

Another option is to configure call manager service parameter  "validate Refer-to URI" as "never validate" in this way CUCM will not validate the URI and the dialog should get replaced."

Conditions:
CUCM replying back to CMS with 4xx/5xx error messages (depending on specific customer's configurations) although replaces support and rerouting is configured on the trunk pointing to CMS.
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