Cisco Call Manager Express/Cisco Unity Express

I am just starting studying the concepts of CCNA Voice and will appreciate if anyone can give me an insight on the relationship between Cisco Unified CME and Cisco Unity Express. Is it always necessary to integrate them together in order to enable the voicemail functionality.
Or maybe, am I correct in saying that it depends on the Cisco Unified CME Version that you do not need anymore the Cisco Unity Express for the voicemail.
Thanks and regards.
Jerry
Or maybe, am I correct in saying that it depends on the Cisco Unified CME Version that you do not need anymore the Cisco Unity Express for the voicemail.
Thanks and regards.
Jerry
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Thanks and regards,
Jerry
Yes and based on how you explained it sounds like you know the answer as well lol
Do you mind if ask some questions on fxo and fxs/DID ?