Hello,
Below is the threshold for email contacts in AACC as mentioned on page 209 and 210 of AACC 6.2 Planning and Engineering guide.
Stand-alone Multimedia server
Inbound Multimedia contacts
per hour (for stand-alone server) 12 000 [ SIP setup ] and 12 000 [ AML setup]
Co-resident Multimedia server
Inbound Multimedia contacts
per hour 1200 [SIP setup ] and 2400 [ AML setup]
Stand-alone Multimedia server
new contacts backlog 20 000 [SIP setup ] and 20 000 [ AML setup]
Co-resident Multimedia server
new contacts backlog 4000 [ SIP setup ] and 4000 [ AML setup]