MWI in SRST - Voice Lab 4 Workbook Volume II v3.5

Hi, Having a trouble with Lab 4 (new v 3.5 version) task 4.28.

CUE configured and works fine, including MWI when connected to CUCM. In SRST mode I can't make MWI working. Configuration is stight forward:

Branch2#
sip-ua
 mwi-server ipv4:177.1.250.254 expires 3600 port 5060 transport udp unsolicited
!
dial-peer voice 3500 voip
 destination-pattern 350[0-2]
 session protocol sipv2
 session target ipv4:177.1.250.254
 dtmf-relay sip-kpml sip-notify
 codec g711ulaw
 no vad
!
telephony-service
 voicemail 3500
 mwi relay
!
ephone-dn  1  octo-line
 ...
 call-forward busy 3500
 call-forward noan 3500 timeout 12
 mwi sip
!
ephone-dn  22
 number 3503...
 mwi-type both
 mwi on
!
ephone-dn  23
 number 3504....
 mwi-type both
 mwi off

 

CUE# sh ccn application
...
strMWI_OFF_DN:     3504
strMWI_ON_DN:      3503
!
SIP Gateway:                            177.1.250.254
SIP Port Number:                       5060
DTMF Relay:                             sip-notify,sub-notify
MWI Notification:                       unsolicited
MWI Envelope Info:                   disabled
SIP RFC Compliance:                 Pre-RFC3261
!
CUE# sh software lic
Core:
 - Application mode: CCM
 - Total usable system ports: 8

After a few hours of troublwshooting I found the document on Cisco site  that says:

"Always verify these items:

  • A Cisco CallManager Express license is present. Issue the show software licenses command. With a Cisco CallManager license, everything works except MWI."

Task requires to have MWI working properly at all times, but I have to upload CCM license to integrate CUE with CUCM.

Is any tricks around CUE configuration or it is my misunderstanding of this task?

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