set flag to avoid race on transfer -both

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@9257 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/applications/mod_commands/mod_commands.c

@@ -881,6 +881,9 @@ SWITCH_STANDARD_API(transfer_function)
 			}
 		} else if (!strcasecmp(arg, "both")) {
 			if (uuid && (other_session = switch_core_session_locate(uuid))) {
+				switch_channel_t *other_channel = switch_core_session_get_channel(other_session);
+				switch_channel_set_flag(other_channel, CF_TRANSFER);
+				switch_channel_set_flag(channel, CF_TRANSFER);
 				switch_ivr_session_transfer(other_session, dest, dp, context);
 				switch_core_session_rwunlock(other_session);
 			}