76Chapter 6 Setting up the private VoIP network
hIn the adjacent Absorbed Length field, select the number of digits to be absorbed. The Absorbed Length applies to the digits of the destination code only.
iIn the Second Route field, enter 999 (the PSTN route).
jIn the adjacent Absorbed Length field, select the number of digits to be absorbed.
Depending on the dialing plan, the destination code is integrated with the DN or is dialed as a prefix to the DN. When a user calls the main office, the SRG examines the destination code to determine the routing. If the First Route, the VoIP trunks, is unavailable, the call is routed to the Second Route, the PSTN, and the External Number is called. Because Overflow was selected, if both the First Route and the Second Route are unavailable, the call is routed using the Normal Route specified in the Normal Route column of the Destination Codes table. Because Auto was selected, the routing occurs without manual intervention.
SRG PSTN access
Access to the SRG PSTN is required for:
•calls to the SRG PSTN from SRG telephones or redirected SRG IP telephones in local mode
•calls from the SRG PSTN to redirected SRG IP telephones in normal mode
•calls from main office telephones to the SRG PSTN, using the VoIP trunks
To achieve this access, a remote access package for the VoIP trunks and a destination code for the PSTN must be configured.
Remote Access Package for VoIP trunks
The SRG views all calls coming in over the VoIP trunks as remote access calls, even though the VoIP pathway is a dedicated trunk to another closed system.
To allow tandem dialing from the main office through the SRG PSTN, or to redirect SRG IP telephones to use the SRG local PSTN, you must specify a remote package that provides access to the PSTN line pool. This remote package is then assigned to each VoIP trunk.
To configure remote access packages
1LocateSet up a remote access package for the PSTN line pool (Configuration > Telephony > Call Security > Remote Access Packages).
2Assign the package to each VoIP trunk (Configuration > Telephony > Lines > Active VoIP Lines > Trunk Type column > Details for Line panel > Restrictions tab > Use remote package field).
