User's Manual

9. Route Pattern 11 routes the call to SIP Trunk Group Number 32. This connects the
Communication Manager Feature Server to the Avaya Aura
®
Session Manager and is
specifically configured for routing local PSTN calls to branches.
10. The Communication Manager Feature Server sends a new SIP INVITE to Avaya Aura
®
Session
Manager over SIP Trunk Group Number 32 with the dialed digits of 19085551111.
11. Avaya Aura
®
Session Manager finds a configured Dial Pattern that matches the dialed number
19085551111 with associated Routing Policy that routes the call to the B5800 Branch Gateway
at branch 811.
12. The digit adaptation for calls going from Avaya Aura
®
Session Manager to that branch include
a digit conversion that transforms 1908-XXX-XXXX into a local PSTN call 8119-XXX-XXXX.
13. Avaya Aura
®
Session Manager forwards the SIP INVITE with dialed digits string 8119-555-1111
to the branch.
14. The B5800 Branch Gateway internally routes the call to one of its PSTN trunks.
Communication Manager configuration required for
survivable extension support
The topics in this section provide the Communication Manager procedures required to
configure survivable extension mode. They are provided here as a reference for the
Communication Manager configuration required to implement the PSTN call flow described in
PSTN example call flow on page 313.
The procedures are provided using the Communication Manager SAT commands. However,
you can use a different administrative interface, such as System Manager, to perform this
configuration.
Verifying Communication Manager licenses
The license file installed on the Communication Manager system controls the maximum
capacities permitted. If there is insufficient capacity or a required feature is not enabled, contact
an authorized Avaya sales representative to make the appropriate changes.
1. Log into the System Access Terminal (SAT) to verify that the Communication
Manager license has proper permissions for features required for this scenario.
2. Enter the display system-parameters customer-options command.
3. Navigate to Page 2 and compare the Maximum Administered SIP Trunks field
value with the corresponding value in the USED column to verify that there is
sufficient remaining capacity for SIP trunks.
PSTN example call flow
314 Implementing the Avaya B5800 Branch Gateway November 2011
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