User's Manual

Appendix C: B5800 Branch Gateway call
flows
Calls from local extensions (i.e. deployed in Distributed branch model)
1. Local phone to local phone
Local phone A B5800 Branch Gateway local phone B
2. Local phone to PSTN (using local trunking)
Local phone
B5800 Branch Gateway B5800 Branch Gateway trunk (e.g. FXO, ISDN, SP
SIP Trunk) PSTN
3. Local phone to PSTN (using centralized trunking)
Local phone
B5800 Branch Gateway Session Manager central gateway/SBC PSTN
4. Local phone to headquarters or other enterprise site
Local phone
B5800 Branch Gateway Session Manager target phone’s controller target
phone
Calls to local extensions (i.e. deployed in Distributed branch model)
1. From PSTN to local extension via IP Office 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 local phone
2. From PSTN direct to Local 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 local phone
3. From headquarters (or other enterprise site) to local phone’s enterprise number
Originating phone
originating phone’s controller Session Manager B5800 Branch
Gateway
local phone
4. From headquarters (or other enterprise site) to local extension via IP Office auto-attendant
Originating phone
originating phone’s controller Session Manager B5800 Branch
Gateway B5800 Branch Gateway auto-attendant caller enters extension number local
phone
Calls from Centralized phones in normal mode (aka sunny day)
1. Centralized phone A to centralized phone B in the same branch
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