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In this section:

Table of Contents
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Related articles:

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Overview

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 Managing SDES-SRTP Profiles are handled in different UI sections of the UI and are explained on their own topic pages.

UDP ports are used for transmission of to transmit 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 and the other for the control information (RTP/RTCP). The number of port pairs determines the number of simultaneous IP Call Legs on the

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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.


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


Info
iconfalse
titleNote:

If you have 100 pairs, and every call has one IP call leg , and one TDM call leg, then you can have 100 calls. However, if a call is IP on the inbound , and also IP on the outbound leg, then it requires two port pairs and this reduces , reducing the total number of simultaneous call calls accordingly (i.e., maximum of 50 IP/IP calls vs. Max 100 IP/TDM calls).

Port Pair Considerations

For

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 Release 7.0 and later only: The number of RTP Port Pairs must be configured slightly larger than the actual number of ports required to support the projected number of calls. We recommend you over-allocate the number of port pairs by approximately 25 - 30% above the number of calls you want to support.


SBC Reserved Ports - Example

Projected Number of Calls

Approximate Number of Port Pairs

Applies To
100 sessions250Audio calls only *
1000 sessions2500Audio calls only *

* Multiple audio and video stream proxy calls will require twice the number of RTP port pairs with the examples provided above.

How Ping Affects Media

The SBC periodically (approximately every 30 seconds) pings all the media endpoints that are engaged in calls with the SBC. For local endpoints (that are on the same subnet as the SBC), this ping mechanism is used to keep refresh the ARP cache refreshed in the SBC. If The call may have audio issues if a local endpoint does not respond to the pings , and if the media IP address is different than differs from the signaling IP address, the call may have audio issues.

Configuring the Media System

Excerpt
  1. In the WebUI, click the Settings tab.

  2. In the left navigation pane, go to Media > Media System Configuration.

    SBC Edge - Media System Configuration


    SBC SWe Edge - Media System Configuration


Media System Configuration 

Port Range - Field Definitions

Start Port

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

Number of Port Pairs

The number of media port pairs used by the SBC system.

  • For SBC 1000/2000. Valid entry: 1 - 4800.
  • For
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    . Valid entry: 2 - 5000.


Info

To determine the last port number, use the formula: First Port Number + (2*Number of Port pairs) - 1.

Example using 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

Regular Call Media Port Range

Specifies a range available for non-Teams (ICE-LITE disabled) call legs.

ICE Call Media Port Range 

Specifies a range available for MS Teams call legs when ICE-LITE is enabled.

When a SBC1K/2K is configured for Teams and if it is behind a firewall, the firewall must open both the port ranges.

Info
titleNote

ICE Call Media Port Range is used only by SBC1K/2K. 


Music on Hold - Field Definitions

Music on Hold Source

Specifies the audio source. Sources can be an uploaded music file (File) or live audio sourced from an FXS port (Live). Default option is File. If you select Live, the FXS Port option is displayed.

When uploading a Music file, the maximum file sizes are as follows:

  • For SBC 1000: 1MiB
  • For SBC 2000: 4MiB
  • For
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    : 5MiB

Music files must be one of the following formats:

  • WAV
  • PCMA (not supported in
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    )
  • PCMU (not supported in
    Spacevars
    0series3
    )
  • PCM (not supported in
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    )

For detailed information about how to upload uploading a Music on Hold file, see Uploading Music on Hold Files - SBC Edge Portfolio or Uploading Music on Hold Files - SBC SWe Edge.

FXS Port

A list of available FSX ports from which live audio may be sourced. The FXS Port field is only visible when Live is selected from the Music on Hold Service drop-down list.

Other Options - Field Definitions

Echo Canceller Type Option

Info

This field applies to SBC 1000/2000 only.

Specifies the type of Line Echo Cancellation (standard or dual filter).

The standard LEC covers 128ms tail length (echo delay) and employs a 24ms sparse (non-zero coefficients) filter. The Dual Filter (background and foreground) Line Echo Canceller (LEC) covers 128ms tail length and uses 48ms sparse foreground filter. The Dual Filter is expected to provide perform better performance during double talk or slow echo-path change. Selection of the Dual Filter option may result in reduced channel densities.

Warning

Ribbon recommends to not apply any applying any change to the Echo Canceller Type Option unless the system is idle (no calls). Applying a change while the system is not idle may result in unknown behavior.


Echo Cancel NLP Option

Info

This field applies to SBC 1000/2000 only.

Specifies the level of echo cancellation employed by the SBC 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.".

Anchor
stunpackets
stunpackets

Send Stun Packets

Info

This field applies to SBC 1000/2000 only.

Specifies whether STUN packets are generated from the SBC. The SBC sends STUN packets on the RTP and RTCP ports on all outbound IP call legs to open ports in the firewall (between the SBC and the Internet). The ability to enable/disable turn this option on/off is for customers who do not have a firewall and would like a way to disable turn off STUN packet generation. Two Three options are available: Enable Always (STUN packets are generated and sent by the SBC), Except Teams (To not initiate STUN packets towards MS Teams) or Disable (STUN packets are not generated). Default option: EnableAlways.