I deployed a CCME 8.0 with CUE 7.2. with a SIP trunk to make calls to the PSTN. There is an auto attendant in the cisco unity which lets dial by number or name or transfer to operator pressing 0 number. When the AA transfers an incoming call to any extension registered in the CCME and there is no answer by the called party the mailbox answers requesting to the caller leave a message after the signal and then press # to send the message. Next, I say the message and press # to send the message. The unity answers saying that the message is too short and I try again. Even thought I try with a longer message until the the max lenght timer message has been reached it keep playing the same "your message is too short, try again".
The issue don´t arise when you leave a message from an internal extension or when a external call contacts the operator and she transfers it to the number requested (internal extension). It only arise when the AA transfer the call.
I've attached a debug ccsip media capture,