/mcpUnsupported configuration for IPv6 • Cisco Unified Communications Manager doesn’t support SIP IPv6 signaling over UDP where the maximum transmission unit (MTU) is greater than 1500. To ensure that you don’t experience intermittent call failure, change the transport protocol to TCP. For more information, see the “Important Notes” section of the Release Notes for Cisco Unified Communications Manager, located at: https://www.cisco.com/c/en/us/support/unified-communications/ unified-communications-manager-callmanager/products-release-notes-list.html Also, see “CSCuo71306” for details on this limitation. • When using IPv6 and Outbound dialer, use a voice gateway IOS that contains the fix for “CSCul43754”. Unsupported configurations and scenarios for Unified CCX Unified CCX doesn’t support the following configurations: • CTI route points with directory numbers (DNs) that are members of line groups and, by extension, that are members of hunt lists of Unified CM. • Shared lines for CTI ports and CTI route points. • Agent devices can’t be shared with any other Directory Number, irrespective of the configured partition. (The Agent device and Directory Number must have a 1:1 relationship). • ICD call answer or ICD call transfer using any third-party attendant console desk software. • Within the same script, using the “Place Call” step to generate a call and then placing the call, back into the same queue (creating a call loop). • SIP REFER between a switchboard and Unified CCX if the transfer is completed after the call is answered on the Unified CCX CTI port because of media reestablishment issues. • During TTS prompt playback, if the call is put on hold and then retrieved, the prompt doesn’t continue from the position at which it was left. • Use of “Consult Transfer”, “Direct Transfer”, or “Redirect” to a translation pattern that maps back to a route point. • Use of “Consult Transfer”, “Redirect”, and “Place Call” steps to invoke or dial into "Conference Now" conferences. • The following scenarios have issues: • External -> Redirect to Unmonitored device -> Call Forward No Answer (CFNA) to UCCX RP Use of Redirect Step to an unmonitored device which then uses CFNA to a UCCX route point. • External -> Consult Transfer to RP ->Consult Transfer to RP -> Redirect to Unmonitored device • External -> Redirect to RP -> Consult Transfer to RP -> Redirect to Unmonitored device • External -> Consult Transfer to RP -> Redirect to RP -> Redirect to Unmonitored device • External -> Consult Transfer to RP -> Redirect to Unmonitored device Thus, use the Call Redirect Step in the script instead of Call Consult Transfer. Release Notes for Cisco Unified Contact Center Express Solution, Release 12.5(1) SU3 9 Cisco Unified Contact Center Express Removed and Unsupported features