User's Manual
142
Document #: LTRT-89729
Mediant 3000
11.9.2.1 First Incoming Packet Mechanism
If the remote device resides behind a NAT device, it’s possible that the device can activate
the RTP/RTCP/T.38 streams to an invalid IP address / UDP port. To avoid such cases, the
device automatically compares the source address of the first received incoming
RTP/RTCP/T.38 stream with the IP address and UDP port of the remote device when the
session was initially opened. If the two are not identical, then the destination IP address of
the outgoing RTP packets is set to the source IP address of the first incoming packet. The
RTP, RTCP and T.38 can thus have independent destination IP addresses and UDP ports.
To enable NAT resolution using the First Incoming Packet mechanism:
1.
Open the General Media Settings page (
Configuration
tab >
VoIP
menu >
Media
>
General Media Settings
).
2.
Set the 'NAT Traversal' parameter to
Enable
.
3.
Click
Submit
.
The EnableIpAddrTranslation and EnableUdpPortTranslation parameters allow you to
specify the type of compare operation that occurs on the first incoming packet. To compare
only the IP address, set EnableIpAddrTranslation to 1, and EnableUdpPortTranslation to 0.
In this case, if the first incoming packet arrives with only a difference in the UDP port, the
sending addresses won’t change. If both the IP address and UDP port need to be
compared, then both parameters need to be set to 1.
11.9.2.2 No-Op Packets
The device's No-Op packet support can be used to verify Real-Time Transport Protocol
(RTP) and T.38 connectivity, and to keep NAT bindings and Firewall pinholes open. The
No-Op packets are available for sending in RTP and T.38 formats.
You can control the activation of No-Op packets by using the
ini
file parameter
NoOpEnable. If No-Op packet transmission is activated, you can control the time interval in
which No-Op packets are sent in the case of silence (i.e., no RTP or T.38 traffic). This is
done using the
ini
file parameter NoOpInterval. For a description of the RTP No-Op
ini
file
parameters, see 'Networking Parameters' on page
RTP No-Op:
The RTP No-Op support complies with IETF Internet-Draft draft-wing-
avt-rtp-noop-03 ("A No-Op Payload Format for RTP"). This IETF document defines a
No-Op payload format for RTP. The draft defines the RTP payload type as dynamic.
You can control the payload type with which the No-Op packets are sent. This is
performed using the RTPNoOpPayloadType
ini
parameter (see 'Networking
Parameters' on page
). The default payload type is 120.
T.38 No-Op:
T.38 No-Op packets are sent only while a T.38 session is activated. Sent
packets are a duplication of the previously sent frame (including duplication of the
sequence number).
Note:
Receipt of No-Op packets is always supported.
Содержание Mediant 3000
Страница 1: ...User s Manual Version 6 6 Enterprise Session Border Controller VoIP Digital Media Gateway Mediant 3000...
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Страница 21: ...Version 6 6 21 Mediant 3000 User s Manual 1 Overview Figure 1 2 Mediant 3000 TP 6310 Functional Block Diagram...
Страница 22: ...User s Manual 22 Document LTRT 89729 Mediant 3000 Figure 1 3 Mediant 3000 TP 8410 Functional Block Diagram...
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Страница 27: ...Part I Getting Started with Initial Connectivity...
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Страница 41: ...Part II Management Tools...
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Страница 103: ...Part III General System Settings...
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Страница 113: ...Part IV General VoIP Configuration...
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Страница 515: ...Part X Maintenance...
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Страница 609: ...Part XII Diagnostics...
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Страница 639: ...Part XIII Appendix...
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Страница 871: ...Version 6 6 871 Mediant 3000 User s Manual 55 Selected Technical Specifications Reader s Notes...
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