Nortel Meridian 1 Succession 1000M Installation And Configuration Manual page 512

Page 512 of 562
553-3011-210 Standard 1.00
Survivability
• The outgoing DOD trunks are used in both normal and survival modes.
• Users with DID numbers have direct inward access in both normal and
survival modes.
Disadvantages:
• Non-DID users of the expansion cabinets or chassis cannot directly
receive incoming calls in survival mode.
• The customer must purchase enough DID/DOD trunks to handle entire
outgoing call volume in survival mode.
Option 2: Outgoing-only, analog CO trunks
Procedure 73
Configuring analog CO trunks for Survivability
1 Configure each IP expansion cabinet or chassis with some outgoing-only,
analog CO trunks.
2 Configure the main cabinet or chassis with incoming and outgoing CO
trunks to handle most external calls.
The operation is similar to Option 1 except that there are no inward DID
capabilities. The Mail intercept feature can again be used in survival mode
to allow incoming calls to be directed to the called person's voicemail.
Advantages:
• Users can make outgoing calls at any time.
• Users can still access their mailboxes in survival mode if the Mail
intercept feature is configured.
• The outgoing-only, analog CO trunks are more cost-effective than
DID/DOD trunks.
Disadvantages:
• Users of the IP expansion cabinets or chassis cannot directly receive
incoming calls in survival mode.
October 2003
End of Procedure