Specifications

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The min refresh interval, which mustn't be less than 90s
·Sesstion-refresher
Choose sesstion-refersher, the default is Uas
6.7.2 IAX Settings
Figure 6-63
1) General
·Bind Port
Port use for IAX2 registrations, Default is 4569.
·Bandwidth
Low/medium/high with this option you can control which codec to be used.
·Min Registration Time
Minimum duration (in seconds) of a IAX2 registration. Default is 60 seconds.
·Max Registration Time
Maximum duration (in seconds) of a IAX2 registration. Default is 1200 seconds.
2）Codecs
A codec is a compression or decompression algorithm that used in the
transmission of voice packets over a network or the Internet.
u-law: A PSTN standard codec, used in North America, that provides very
good voice quality and consumes 64kbit/s in each direction (receiving and
transmitting) of a VoIP call.
a-law: A PSTN standard codec, used outside of North America, that
provides very good voice quality and consumes 64kbit/s in each direction
(receiving and transmitting) of a VoIP call.