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Chapter 6 Setting up the private VoIP network 77
SRG50 Configuration Guide
PSTN destination codes configuration
To allow SRG telephones to dial out over the PSTN and to allow main office telephones to tandem
out through the local SRG PSTN, you need to define a destination code that accesses the PSTN
line pool without an External Number. Frequently, this code is 9, but it does not have to be.
The following procedure provides a basic PSTN routing setup.
To configure destination codes for the PSTN
1 Access the Dialing Plan - Routing panel (Configuration > Telephony > Dialing Plan >
Routing).
2 Select the Routes tab. See the Networking Configuration Guide (NN40020-603) to:
a Add a new route (for the PSTN line pool).
b From the DN Type list, select Public.
c Leave the External Number field blank.
d Assign the PSTN line pool to the route (select the line pool from the Use Pool list).
3 Access the Dialing Plan - Routing panel (Configuration > Telephony > Dialing Plan >
Routing).
4 Select the Destination Codes tab. See the Networking Configuration Guide (NN40020-603)
to:
a Add the destination code to be used to access the local (SRG) PSTN.
Users on both SRG and main office telephones dial this destination code to access the
local (SRG) PSTN. If this code goes only to the SRG PSTN, enter 9 + Wild Card 1. This
wild card allows any numbers not used by other 9-based destination codes.
In normal mode, the destination code is forwarded from the main office to the SRG for
SRG IP telephone calls that are connecting to the SRG PSTN.
The default line pool access code for pool A is 9. Delete this access code
before you attempt to create a destination code with 9.
Note: For main office programming, this code is the offnet dialing code
that the gatekeeper recognizes for routing to the SRG.
At the main office, zone-based digit manipulation is used to add a Zone
Digit Prefix (ZDP) to PSTN calls from SRG IP telephones. The ZDP
allows the main office to differentiate between local PSTN calls made
from main office telephones (to the main office PSTN) and PSTN calls
made from SRG IP telephones (to the SRG PSTN). The main office
administrator f supplies this ZDP with the prerequisite information.