Installation & Maintenance Manual 14. Restricting Communication to Mediation Server Only
Version 6.8 149 Microsoft Lync Server
14 Restricting Communication to Mediation
Server Only
The procedure below describes how to restrict IP communication, by allowing
communication only between the PSTN Gateway and the Mediation Server. This ensures
that the PSTN Gateway accepts and sends SIP calls only from and to the Mediation Server
(as required by Microsoft). This is done by enabling the IP Security feature and then
defining the allowed (“administrative” list) IP addresses (or FQDNs) in the Proxy Set table.
To allow IP communication only between the PSTN Gateway and Mediation
Server:
1. Open the Advanced Parameters page (Configuration tab > VoIP menu > SIP
Definitions > Advanced Parameters).
Figure 14-1: Advanced Parameters Page
2. From the ‘IP Security’ drop-down list, select Secure Incoming calls to enable the
security feature to accept and send SIP calls only from and to user-defined IP
addresses or FQDN (i.e., Mediation server) configured in the ‘Proxy Set table’ (see
Step 1).
3. Click Submit to apply your settings.
4. On the toolbar, click Burn to save the changes to the Enhanced gateway flash
memory.
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