49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
/* 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);
|
|
}
|