.
</p>
<p>It accepts the following values:
</p><dl compact="compact">
<dt>&lsquo;<samp>udp</samp>&rsquo;</dt>
<dd><p>Use UDP as lower transport protocol.
</p>
</dd>
<dt>&lsquo;<samp>tcp</samp>&rsquo;</dt>
<dd><p>Use TCP (interleaving within the RTSP control channel) as lower
transport protocol.
</p>
</dd>
<dt>&lsquo;<samp>udp_multicast</samp>&rsquo;</dt>
<dd><p>Use UDP multicast as lower transport protocol.
</p>
</dd>
<dt>&lsquo;<samp>http</samp>&rsquo;</dt>
<dd><p>Use HTTP tunneling as lower transport prot