Firewall And Nat - Unify OpenStage Developer's Manual

c01.fm
Getting Started
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Basic Network Infrastructure
1.3.2

Firewall and NAT

If the phones and the provisioning service reside in different networks or subnets, which are
separated by a firewall and/or NAT, it may be impossible for the provisioning service to establish
a connection with the phones. In this case, provisioning service driven interactions may not be
possible (for details about provisioning service driven interactions, please refer to Section
1.4.4.2, "Contact-me Messages" and Section 3.1.2, "Provisioning Service Driven Interaction").
To enable a solution for this problem, the phone can be configured to periodically poll the pro-
visioning service, or a special proxy, for new messages. Thus, provisioning service driven in-
teractions are possible even when the provisioning service is located behind a firewall, or in a
DMZ. For further information, please refer to Section 1.4.4.3, "Polling Request To Bridge A Fire-
wall" and Section 3.1.2.2, "Provisioning Service Located Behind A Firewall".
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Provisioning Service, Developer's Guide