User's Manual

Calls to Centralized phones in normal mode (aka sunny day)
1. From PSTN to centralized phone’s DID (LDN is associated with local B5800 Branch Gateway
trunk)
PSTN
B5800 Branch Gateway trunk (e.g. FXO, ISDN, SP SIP trunk) B5800 Branch
Gateway Session Manager CM-FS Session Manager centralized phone
2. From PSTN to centralized phone via B5800 Branch Gateway auto-attendant (branch auto-
attendant LDN is associated with local B5800 Branch Gateway trunk)
PSTN
B5800 Branch Gateway trunk (e.g. FXO, ISDN, SP SIP Trunk) B5800 Branch
Gateway auto-attendant caller enters extension number B5800 Branch Gateway modifies
extension number to user’s enterprise number Session Manager CM-FS Session
Manager
centralized phone
3. From PSTN to centralized phone’s DID (if LDN is ported to centralized trunks at the core)
PSTN central gateway/SBC Session Manager CM-FS Session Manager centralized
phone
Note:
The B5800 Branch Gateway is not involved in handling the call in this scenario.
4. From branch local phone to centralized phone (dialing phone’s enterprise number)
Local phone
B5800 Branch Gateway Session Manager CM-FS Session Manager
centralized phone
5. From headquarters (or other enterprise site) to centralized phone’s enterprise number
Originating phone
originating phone’s controller Session Manager CM-FS Session
Manager
centralized phone
Note:
The B5800 Branch Gateway is not involved in handling the call in this scenario.
Calls from Centralized phones in survivability mode (aka rainy day)
1. Centralized phone A to Centralized phone B in the same branch
Centralized phone A B5800 Branch Gateway centralized phone B
Note:
In rainy-day the centralized phones register to survivability service on the B5800 Branch
Gateway in the branch.
2. Centralized phone to local phone (dialing either local phone’s enterprise number or short
extension)
Centralized phone
B5800 Branch Gateway local phone
3. Centralized phone to PSTN
Implementing the Avaya B5800 Branch Gateway November 2011 311