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Specifies the starting number for the RTP and RTCP port range.

Number of Port Pairs

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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:

default value for

For starting port number (16384) and the

(default)

number for port pairs is 600.
There are 600 pairs, meaning there are 1200 individual ports. 16384 + (1200-1) = 17583

Number of Port Pairs

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DSCP

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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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