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The Media System Configuration contains system-wide settings for the Media System, configuring the media system means setting the number of RTP/RTCP port pairs and the starting port. Other aspects of media handling, such as Media Profiles, Lists, and Media Crypto Profiles are handled in different sections of the UI and are explained on their own topic pages.

UDP ports are used for transmission of VoIP calls employing RTP protocols (RTP over UDP). The start port is the first port that can be used for a call. Calls require a pair of ports, one for the voice the other for the control information (RTP/RTCP). The number of port pairs determines the number of simultaneous IP Call Legs on the Sonus SBC 1000/2000

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(SBC). For example; if you have 100 pairs, you can have a maximum of 100 simultaneous IP Call Legs. This does not affect the number of TDM/TDM calls.

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SBC Reserved Ports

Port

Protocol

PortProtocol

1

RAW

500UDP

22

TCP

514

UDP

53TCP4500UDP

80

TCP

30000UDP

161

UDP

30001

UDP

443

TCP

16384 to17583

RTP/RTCP

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The number of media port pairs used by the Sonus SBC 1000/2000 system. 

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To determine the last port number:

First Port Number + (2*Number of Port pairs) - 1.

Example:

Given: For starting port number (16384) and the number for port pairs is 600.
There are 600 pairs, meaning there are 1200 individual ports. 16384 + (1200-1) = 17583

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Specifies the DSCP value for all RTP/RTCP packets from the Sonus SBC 1000/2000.

This is used whenever the Sonus SBC 1000/2000 is connected to an external gateway that handles both data and voice traffic. When large volumes of data traffic as well as all VoIP traffic flow through the same router, a policy may be created that used the DSCP value of the media packets. The policy should be structured such that VoIP media packets receive higher priority and are expedited while other packets receive a lower priority and are queued. Network administrators should ensure that the non-VOIP packets are tagged with a different DSCP value on their network. Typically, the choice of DSCP for various kinds of packet flows in the network is determined by the network administrator and is configured on all routers within that IP network.

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Specifies the level of echo cancellation employed by the Sonus SBC 1000/2000 Nonlinear Signal Processor.

The default value is Mild. However there are two additional levels of echo cancellation, Strong and Aggressive. As each telephony system implementation varies, their echo characteristics similarly vary. Adjust the level of echo cancellation to suit your particular deployment. Too little cancellation may result in a persistent echo, too aggressive and you may experience voice "clipping".

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Specifies whether STUN packets are generated from the Sonus SBC 1000/2000. The Sonus SBC 1000/2000 sends STUN packets on the RTP and RTCP ports on all outbound IP call legs to open ports in the firewall (between the Sonus SBC 1000/2000 and the Internet). The ability to enable/disable this option is for customers who do not have a firewall and would like a way to disable STUN packet generation. Two options are available: Enable (STUN packets are generated and sent by the Sonus SBC 1000/2000) or Disable (STUN packets are not generated). Default option: Enable.

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