Voicemail length

Hello All, we need to limit voicemail lengths to 3 min or so.  Lookng around, i thought that this value was a global one in Asterisk - We are at 1.4for Asterisk, V6 thirdlane.  A tenant is receiving 60 min+ spam fax calls - 

How can we block these or limit the length?

is there a way to hangup on fax tone for a DID or inbound route?

Thank you!