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Diffstat (limited to 'openbsc/include/openbsc/mgcp.h')
-rw-r--r-- | openbsc/include/openbsc/mgcp.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/openbsc/include/openbsc/mgcp.h b/openbsc/include/openbsc/mgcp.h new file mode 100644 index 000000000..fa6224c12 --- /dev/null +++ b/openbsc/include/openbsc/mgcp.h @@ -0,0 +1,48 @@ +/* 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); +} |