0.0.0 (all IP addresses).
IAX1
Compatibility
Allows IAX compatibility with old IAX1 implementations. This
should be enabled only if your PBX is connected to old Asterisk-based
servers, prior to version 1.0.X.
No Checksums Disable UDP checksums.
Delay Reject If an IAX reject is required to be sent for an authentication request,
delay the response. This enables increased security against IAX bruteforce
attacks.
ADSI If you have ADSI-enabled phones directly connected to your PBX, you
can enable support for these here.
Jitter Buffer Settings
In voice over IP (VoIP), a jitter buffer is a shared data area where voice packets
can be collected, stored, and sent to the voice processor in evenly spaced intervals.
Variations in packet arrival time, called jitter, can occur because of network
congestion, timing drift, or route changes. The jitter buffer, which is located at the
receiving end of the voice connection, intentionally delays the arriving packets so
that the end user experiences a clear connection with very little sound distortion.
There are two kinds of jitter buffers, static and dynamic. A static jitter buffer is
hardware-based and is configured by the manufacturer. A dynamic jitter buffer
is software-based and can be configured by the network administrator to adapt to
changes in the network's delay.
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