up_session_size : unit <span>&#45;&gt;</span> Unsigned.size_t</code></dt><dd><p><code>outbound_group_session_size ()</code></p><p>Get the size of an outbound group session, in bytes.</p></dd></dl><dl><dt class="spec value" id="val-outbound_group_session"><a href="#val-outbound_group_session" class="anchor"></a><code><span class="keyword">val</span> outbound_group_session : <span>unit Ctypes_static.ptr</span> <span>&#45;&gt;</span> <span><a href="../Types/OutboundGroupSession/index.html#type-t">Types.Outboun