DBL Technology GoIP-1 User Manual page 27

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4. Trunk Gateway Mode
This mode offers a seamless interface with the SIP Trunk configuration in a SIP server. In general, SIP
registration is not required in this mode. Using the Trunk Gateway mode is an advantage on saving a SIP
license if your SIP server requires a license per SIP registration. If both the SIP server and the GoIP are not
in the same network segment, it is recommended that both should have a public IP in order to ensure
reliable operation. Installing either one or both (SIP server and the device) behind NAT may or may not
work properly depending on the SIP Server and the router configurations (on each side) as well. In this
case, the SIP server is required to support NAT. Both routers should also be setup to map the signaling
port and media ports to the SIP Server and the GoIP properly. Otherwise, VoIP calls may fail to establish
properly in this network environment.
The device accepts calls from up to 3 IP addresses (SIP Trunk Gateway1, SIP Trunk Gateway2, SIP Trunk
Gateway3) specified and then dial out the call via an Idle channel that is used the least (in terms of the
number of calls dialed). The last part of the SIP Trunk Gateway IP addresses can be specified as "X" or "x"
to represent that the whole segment IP addresses (0 - 255). Calls originated from the IP segment are
accepted.
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GoIP User Manual
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