User's Manual 250 Document #: LTRT-68822
Mediant 2000
assigned to a range of IP-PBX users.
♦ Voice coder: G.723.
• ITSP-B:
♦ Implements Proxy servers with IP addresses 216.182.224.202 and
216.182.225.202, using TCP.
♦ Allocates a range of PSTN numbers beginning with 0200, which is assigned
to a range of IP-PBX users.
♦ Voice coder: G.723.
Registration and authentication is required by both ITSP's, which is performed by the
device on behalf of the IP-PBX. The SIP REGISTER messages use different URI's
(host name and contact user) in the From, To, and Contact headers per ITSP as well
as username and password authentication.
Outgoing calls from IP-PBX users are routed according to destination:
• If the calls are dialed with the prefix "+81", they are routed to ITSP-A (Region A).
• If the calls are dialed with the prefix "9", they are routed to the local PSTN
network.
• For all other destinations, the calls are routed to ITSP-B.
The device is also connected to the PSTN through a traditional T1 ISDN trunk for local
incoming and outgoing calls. Calls dialed from the enterprise's IP-PBX with prefix '9'
are sent to the local PSTN. In addition, in case of Internet interruption and loss of
connection with the ITSP trunks, all calls are rerouted to the PSTN.
The figure below provides an illustration of this example scenario:
Figure 20-5: SIP Trunking Setup Scenario Example
The steps for configuring the device according to the scenario above can be summarized
as follows:
Enable the IP-to-IP feature (see 'Step 1: Enable the IP-to-IP Capabilities' on page
251).
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