Version 7.2 203 Mediant 1000B Gateway & E-SBC
User's Manual 14. Media
2. Configure the following parameters:
• 'RTP Redundancy Depth' (RTPRedundancyDepth) - enables the device to
generate RFC 2198 redundant packets.
• For Gateway application only: 'Enable RTP Redundancy Negotiation'
(EnableRTPRedundancyNegotiation) - enables the device to include the RTP
redundancy dynamic payload type in the SDP, according to RFC 2198.
• '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.
14.3.5 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 64,000.
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 10. 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 [BaseUDPPort parameter value + (number
of channels * 10)]
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 to 6000, the port range for 20 channels is:
6000 to [6000 + (20*10)] = 6000 to (6000 + 200) = 6000 to 6200
You can also configure specific port ranges for specific SIP entities, using Media Realms
(see ''Configuring Media Realms'' on page 327). 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).
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