Configuring Rtp Base Udp Port - AudioCodes Mediant 1000B User Manual

14.3.4 Configuring RTP Base UDP Port

You can configure the range of local UDP ports for RTP, RTCP, and T.38 media streams.
The range of possible UDP ports that can be used, depending on configuration, is 6,000
through to 64,000. The device assigns ports randomly to the traffic within the configured
port range.
For RTCP and T.38 traffic, the port offset from the RTP port used for the voice session
(channel) is one and two, respectively. For example, if the voice session uses RTP port
6000, the RTCP port and T.38 port for the session is 6001 and 6002, respectively.
However, you can configure the device to use the same port for RTP and T.38 packets, by
setting the T38UseRTPPort parameter to 1.
Within the port range, the device allocates the UDP ports in "jumps" (spacing) of 10
(default). For example, if the port range starts at 6000 and the UDP port spacing is 10, the
available ports include 6000, 6010, 6020, 6030, and so on.
The port range is calculated using the following equation:
Where, BaseUDPPort is a parameter for configuring the lower boundary of the UDP port
range (default is 6000).
For example, if the base UDP port is set to 6000, the port range for 20 channels is:
You can also configure specific port ranges per logical media-type IP network interface,
using Media Realms (see Configuring Media Realms on page 251). However, the port
range configured for the Media Realm must be within the range configured by the
BaseUDPPort parameter.
The following procedure describes how to configure the RTP base UDP port in the Web
interface.

To configure the RTP base UDP port:
1. Open the RTP/RTCP Settings page (Configuration tab > VoIP menu > Media >
RTP/RTCP Settings). The relevant parameter is listed under the 'General Settings'
group, as shown below:
Figure 14-8: RTP Based UDP Port in RTP/RTCP Settings Page
2. Set the 'RTP Base UDP Port' parameter to the required value.
3. Click Submit.
4. Reset the device for the settings to take effect.
Note: You can also configure the base UDP port for calls belonging to a specific SIP
entity (IP Group), using IP Profiles (see Configuring IP Profiles on page 302).
User's Manual
BaseUDPPort to (BaseUDPPort + number of channels*10)
6000 to (6000 + 20*10) = 6000 to (6000 + 200) = 6000 to 6200
Mediant 1000B Gateway & SBC
174 Document #: LTRT-27034