Configuring Rtp Base Udp Port - AudioCodes Mediant 3000 User Manual

13.3.4 Configuring RTP Base UDP Port

You can configure the range of UDP ports for RTP, RTCP, and T.38. The UDP port range
can be configured using media realms in the Media Realm table, allowing you to assign
different port ranges (media realms) to different interfaces. However, if you do not use
media realms, you can configure the lower boundary of the UDP port used for RTP, RTCP
(RTP port + 1) and T.38 (RTP port + 2), using the 'RTP Base UDP Port' (BaseUDPport)
parameter. For example, if the BaseUDPPort is set to 6000, then one channel may use the
ports RTP 6000, RTCP 6001, and T.38 6002, while another channel may use RTP 6010,
RTCP 6011, and T.38 6012.
The range of possible UDP ports is 6,000 to 64,000 (default base UDP port is 6000). The
port range is calculated using the BaseUDPport parameter as follows: BaseUDPPort to
(BaseUDPPort + <channels -1> * 10)
The default local UDP ports for audio and fax media streams is calculated using the
following formula: BaseUDPPort + (Channel ID * 10) + Port Offset
Where the port offsets are as follows:

Audio RTP: 0

Audio RTCP: 1

Fax T.38: 2
For example, the local T.38 UDP port for channel 30 is calculated as follows: 6000 +
(30*10) + 2 = 6302
The maximum (when all channels are required) UDP port range is calculated as follows:

Mediant 3000/TP-6310: BaseUDPport to (BaseUDPport + 4031*10) - for example, if
the BaseUDPPort is set to 6,000, then the UDP port range is 6,000 to 46,310

Mediant 3000/TP-8410: BaseUDPport to (BaseUDPport + 4031*10) - for example, if
the BaseUDPPort is set to 6,000, then the UDP port range is 6,000 to 46,310
Notes:
The procedure below describes how to configure the RTP base UDP port using the Web
interface.

To configure the RTP base UDP port:
1. Open the RTP/RTCP Settings page (Configuration tab > VoIP menu > Media
submenu > RTP/RTCP Settings). The relevant parameter is listed under the 'General
Settings' group, as shown below:
Figure 13-9: 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.
User's Manual
•
The device allocates the UDP ports randomly to the channels.
•
To configure the device to use the same port for both RTP and T.38
packets, set the T38UseRTPPort parameter to 1.
•
If you are using Media Realms (see 'Configuring Media Realms' on page
194), the port range configured for the Media Realm must be within this
range defined by the BaseUDPPort parameter.
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Mediant 3000
Document #: LTRT-89729