<para>R/O PRI Nonzero if the channel has no B channel.
The channel is either on hold or a call waiting call.</para>
</enum>
+ <enum name="buffers">
+ <para>W/O Change the channel's buffer policy (for the current call only)</para>
+ <para>This option takes two arguments:</para>
+ <para> Number of buffers,</para>
+ <para> Buffer policy being one of:</para>
+ <para> <literal>full</literal></para>
+ <para> <literal>immediate</literal></para>
+ <para> <literal>half</literal></para>
+ </enum>
+ <enum name="echocan_mode">
+ <para>W/O Change the configuration of the active echo
+ canceller on the channel (if any), for the current call
+ only.</para>
+ <para>Possible values are:</para>
+ <para> <literal>on</literal> Normal mode (the echo canceller is actually reinitalized)</para>
+ <para> <literal>off</literal> Disabled</para>
+ <para> <literal>fax</literal> FAX/data mode (NLP disabled if possible, otherwise
+ completely disabled)</para>
+ <para> <literal>voice</literal> Voice mode (returns from FAX mode, reverting the changes that were made)</para>
+ </enum>
</enumlist>
<para><emphasis>chan_ooh323</emphasis> provides the following additional options:</para>
<enumlist>