Configuring Rtp Base Udp Port - AudioCodes Mediant 4000 SBC User Manual


To configure RFC 2833 payload:
1. Open the RTP/RTCP Settings page (Setup menu > Signaling & Media tab > Media
folder > RTP/RTCP Settings).
2. Configure the following parameters:
•
'RTP Redundancy Depth' (RTPRedundancyDepth) - enables the device to
generate RFC 2198 redundant packets.
•
'RFC 2833 TX Payload Type' (RFC2833TxPayloadType) - defines the Tx RFC
2833 DTMF relay dynamic payload type.
•
'RFC 2833 RX Payload Type' (RFC2833RxPayloadType) - defines the Rx RFC
2833 DTMF relay dynamic payload type.
•
'RFC 2198 Payload Type' (RFC2198PayloadType) - defines the RTP redundancy
packet payload type according to RFC 2198.
3. Click Apply.

14.3.3 Configuring RTP Base UDP Port

You can configure the range (pool) of local UDP ports from which the device allocates
ports to media (RTP, RTCP, and T.38) channels (legs). The maximum range of UDP ports
is from 6,000 through to 65,535.
The consecutive port offset from the RTP port for RTCP and T.38 traffic is one and two,
respectively. For example, if the voice session uses RTP port 6000, the device allocates
ports 6001 and 6002 for RTCP and T.38, respectively. However, you can configure the
device to use the same port for RTP and T.38 packets, by configuring the T38UseRTPPort
parameter to 1.
Within the port range, the device allocates the UDP ports per media channel (leg) in
"jumps" (spacing) of 4, 5 (default) or 10, configured by the UdpPortSpacing parameter. For
example, if the port range starts at 6000 and the UDP port spacing is 10, the available
ports are 6000, 6010, 6020, 6030, and so on. Within the port range, the device assigns
these ports randomly to the different media channels. For example, it allocates port 6000
to leg 1, port 6030 to leg 2, and port 6010 to leg 3.
You can configure the starting port (lower boundary) of the port range (default is 6000),
using the BaseUDPPort parameter. Once configured, the port range is according to the
following equation:
<BaseUDPPort parameter value> to 65,535
Where, number of channels is the maximum number of purchased channels for the device
(included in the installed License Key).
For example, if you configure the BaseUDPPort parameter to 6000, the port range is 6000
to 65,535.
You can also configure specific port ranges for specific SIP entities, using Media Realms
(see ''Configuring Media Realms'' on page 301). You can configure each Media Realm with
a different UDP port range and then associate the Media Realm with a specific IP Group,
for example. However, the port range of 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 through the
Web interface.

To configure the RTP base UDP port:
1. Open the RTP/RTCP Settings page (Setup menu > Signaling & Media tab > Media
folder > RTP/RTCP Settings).
User's Manual 186
Mediant 4000 SBC
Document #: LTRT-41729