| /* A Media Gateway Control Protocol Media Gateway: RFC 3435 */ |
| |
| /* |
| * (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * (C) 2009 by on-waves.com |
| * All Rights Reserved |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| */ |
| |
| unsigned int rtp_base_port = 4000; |
| |
| /** |
| * Calculate the RTP audio port for the given multiplex |
| * and the direction. This allows a semi static endpoint |
| * to port calculation removing the need for the BSC |
| * and the MediaGateway to communicate. |
| * |
| * Port usage explained: |
| * base + (multiplex * 2) + 0 == local port to wait for network packets |
| * base + (multiplex * 2) + 1 == local port for rtcp |
| * |
| * The above port will receive packets from the BTS that need |
| * to be patched and forwarded to the network. |
| * The above port will receive packets from the network that |
| * need to be patched and forwarded to the BTS. |
| * |
| * We assume to have a static BTS IP address so we can differentiate |
| * network and BTS. |
| * |
| */ |
| int rtp_calculate_port(int multiplex, int base) |
| { |
| return base + (multiplex * 2); |
| } |