There is a timeout happening -005208: Feb 5 2019 19:27:51.034 UTC: %VOICE_IEC-3-GW: SIP: Internal Error (ACK wait timeout): IEC=1.1.129.7.66.0 on callID 1180 GUID=EE74742F28B211E98551D21BBC9A1796005209: Feb 5 2019 19:27:51.035 UTC: //1180/EE74742F8...

AFAIK the requirement is still the same.If you are splitting the CUBE's across DC's, you cannot use HSRP. You could have an ACTIVE/ACTIVE CUBE deployment where the CUCM will be responsible for failover etc.

Not sure why would you buy a BE6k for 60 users only. If that is the case though, look into a CME/CUE bundle running on a ISR-4k box. If you have a virtual environment, you can deploy a vCUE for the voicemail bit.Also, you could look into BE4k for a c...

Do you have SRST or CME-as-SRST configured ? With SRST, phones do not get config file from the SRST router.