SIP User's Manual 368 Document #: LTRT-83310
Mediant 600 & Mediant 1000
18.9.2.3 Step 3: Define a Trunk Group for the Local PSTN
For incoming and outgoing local PSTN calls with the IP-PBX, you need to define the Trunk
Group ID (#1) for the T1 ISDN trunk connecting between the device and the local PSTN.
This Trunk Group is also used for alternative routing to the legacy PSTN network in case of
a loss of connection with the ITSP's.
To configure the Trunk Group for local PSTN:
1. Open the Trunk Group Table page (Configuration tab > VoIP menu > GW and IP to
IP submenu > Trunk Group > Trunk Group).
2. Configure Trunk Group ID #1 (as shown in the figure below):
• From the 'From Trunk' and 'To Trunk' drop-down lists, select 1 to indicate Trunk 1
for this Trunk Group.
• In the 'Channels' field, enter the Trunk channels or ports assigned to the Trunk
Group (e.g. 1-31 for E1 and 1-24 for T1).
• In the 'Phone Number' field, enter any phone number (logical) for this Trunk (e.g.
1000).
• In the 'Trunk Group ID' field, enter "1" as the ID for this Trunk Group.
3. Configure the Trunk in the Trunk Settings page (Configuration tab > VoIP menu >
PSTN submenu > Trunk Settings).
18.9.2.4 Step 4: Configure the Proxy Sets
This step describes how to configure the following Proxy Sets:
Proxy Set ID #1 defined with two FQDN's for ITSP-A
Proxy Set ID #2 defined with two IP addresses for ITSP-B
Proxy Set ID #3 defined with an IP address for the IP-PBX
The Proxy Sets represent the actual destination (IP address or FQDN) to which the call is
routed. These Proxy Sets are later assigned to IP Groups (see 'Step 5: Configure the IP
Groups' on page 370).
To configure the Proxy Sets:
1. Open the Proxy Sets Table page (Configuration tab > VoIP menu > Control
Network submenu > Proxy Sets Table).
2. Configure Proxy Set ID #1 for ITSP-A:
a. From the 'Proxy Set ID' drop-down list, select 1.
b. In the 'Proxy Address' column, enter the FQDN of ITSP-A SIP trunk Proxy
servers (e.g., Proxy1.ITSP-A and Proxy2. ITSP-A).
c. From the 'Transport Type' drop-down list corresponding to the Proxy addresses
entered above, select TLS.
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