D-Link VOIP DVX-7090 - Manual (Page 19)

Configuration
Fig. 16 NAT- , fax-related and protocol-specific settings
The combo box NAT serves to select a NAT traversal policy and offers triple choice:
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direct means that call packets will go direct without enabling NAT traversal
-
forced stands for the NAT traversal function enabled
-
detect denotes automatic detection of NAT presence
Select direct when you are positive that communication with the endpoint you are
configuring does not involve network address translation (NAT). Select the option forced
when it is known that the endpoint sits behind a NAT router. Select detect when unsure
about the situation with NAT.
FAX T.38 allows you to enable/disable T.38 fax support.
The Convert combo box offers three options:
– none (no codec conversion is performed even if the call originator and terminator
have a common codec capability)
– adaptive (the DVX-7090 Router performs codec conversion when necessary, i.e.
when the calling and called endpoints feature no common codec capabilities)
– forced (the DVX-7090 Router always performs conversion of media even when a
common capability exists)
Note:
The use of codec conversion should be judicious as codec conversion is very
demanding in terms of the system computing power and takes toll on voice quality. The option
adaptive is the best choice as with adaptive selected the Router tries to put the call through
without conversion and automatically engages the codec converter when the call is impossible
otherwise. The option forced is for extraordinary cases when two endpoints cannot communicate
otherwise even with a common codec capability.
The Repacketize control allows you to manage repacketization of media streams that may be
necessary to improve the quality of speech and remedy possible silence suppression
incompatibility occurring occasionally in terminal equipment. The options of the Repacketize
drop-down list include:
– none disables repacketization of media streams
– incoming (enables repacketization of ingress media)
– outgoing (enables repacketization of egress media)
– both (enables repacketization of ingress and egress streams)
DVX-7090 VoIP Router page 19 of 83