Determine the appropriate routing mode for a Voice over IP (VoIP) Domain Gateway object that
supports Q.931.

A.
Call Setup and Call Control

B.
Call Setup

C.
Direct and Call Control

D.
Call Proxy and Call Control

E.
Direct

Explanation:

Creating the Gatekeeper
The gatekeeper object must be created to securely pass H.323 traffic through
your firewall. To create a gatekeeper object, follow these steps:
1.
Go to Manage _
Network Objects Go to the Network Objects window
and choose New _
VoIP Domains _
VoIP Domain H.323 Gatekeeper.
2. In the General tab, shown in Figure below, define the gatekeeper’s Name,
Comment, and Color. The network object or address range object that
represents your soft phones subnet and/or the object that represents
your gateway (if you’re using analog phones) should be defined in the
Related Endpoints Domain field. If you are using a combination of
analog and digital phones then combine the gateway and the network
range in a Simple Group and define it here. The host node object that
represents your H.323 gatekeeper machine should be defined in the
VoIP Installed At field.

3. Under the Routing Mode tab of the gatekeeper properties, you can
choose from three allowed routing modes. This option identifies
which connections will be rerouted from your VoIP gatekeeper to the
VoIP gatekeeper on the other end. At least one of the following choices
must be checked depending on the VoIP equipment that is being utilized:
Direct The H.225 and Q.931 protocols, which allow gatekeeper to
gatekeeper communication and call setup and breakdown respectively,
are rerouted if this check box is selected.
Call Setup (Q.931) H.245 which is the control protocol used by H.323

for multimedia communication will be rerouted from gatekeeper to gatekeeper
along with the Q.931 protocols.
Call Setup (Q.931) and Call Control (H.245) Connections that deal
with video, audio and controls connections associated with video and
audio will be rerouted gatekeeper to gatekeeper.