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In this section:

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To create or modify a Media List:

...

  1. Click the Create Media List () icon at the top of the Media List View page.

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Media List - Field Definitions

Description

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Name/description for the Media List.

Media Profiles List

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Note

When selecting the G729 profile:  If your device supports only G729a, then be sure to configure Silence Suppression to Disable.  The G729a codec does not support Silence Suppression.

SBC SWe Lite: The G.722 codec does not support Silence Suppression.

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FieldDescription
DescriptionA name that describes the Media List. Typically, the SIP Signaling Group specifies the Media List for calls that use the Signaling Group.
Media Profiles List

...

Specifies a list of Media Profiles

...

for use with this Media List.

...

Codec profile order

...

determines the

...

order in which

...

codecs

...

are specified in

...

SIP message(s) sent to

...

a peer.

...

Consider user preferences when ordering codec profiles, placing the more desirable codecs

...

above the less desirable ones. Use the following options to edit the profile:

  • Up. Moves the profile up in the list.
  • Down. Moves the profile down in the list.
  • Add/Edit. From the Select Media Profile box, click to select a profile and click OK. The profile is added to the list.
  • Remove. Removes the profile from the list.

 

...

Note

When selecting the G729 profile:  If your device supports only G729a, then be sure to configure Silence Suppression to Disable.  The G729a codec does not support Silence Suppression.

SBC SWe Lite: The G.722 codec does not support Silence Suppression.

Crypto Profile ID

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Specifies the Media Crypto Profiles to be used with this Media List.

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If you are not using (Secure Real Time Protocol (SRTP), set this parameter to None.

Media DSCP

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SDES-SRTP Profile

Specifies the profile for authentication/encryption protocols applied with this Media List. For details about profiles for Source Description RTP packet (SDES) and Secure Real-time Transport Protocol (SRTP), refer to Managing SDES-SRTP Profiles.

Note: If you are not using SRTP, set this parameter to None.

DTLS-SRTP Profile

Specifies the profile for secure communications protocols applied with this Media List. The DTLS-SRTP extension of the Datagram Transport Layer Security (DTLS) protocol negotiates SRTP keying between the SBC 1000/2000 and Microsoft Teams over the UDP media port.

Options in the drop-down list are derived from the DTLS-SRTP Profiles configured on the SBC Edge. For details, refer to Working with DTLS-SRTP Profiles.

Media DSCP

The Differentiated Services Code Point (DSCP) value to assign for all media flows created using this Media List. The default Media DSCP value is 46 and the allowed range is [0..63].

...

Choose an appropriate DSCP value based on the QoS policies of the IP network traversed by the media packets. 

RTCP Mode

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Specifies either RTCP or RTCP-XR usage for this profile

Specifies the mode for carrying statistical and control data for RTP when using this media list:

Note: The RTCP Mode field is not applicable for

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  • RTCP: Sends

...

  • basic RTCP messages to the peer.
  • RTCP-XR (Extended Reports):

...

  • Sends Real Time Control Protocol - Extended Reports (RTCP-XR

...

  • ) packets to the peer. Some SIP endpoints cannot handle the RTCP-XR packets that include more information, so specify basic RTCP to lessen the risk of overloading. Only select RTCP-XR when you know that the far end supports it.
    RTCP-XR

...

  • provides packet transport quality metrics

...

  • designed to supplement the packet-loss

...

  • metrics and the roundtrip delay

...

  • measurements provided by RTCP.

...

  • The extended reports also include metrics for IP Packet Delay Variation (IPDV) based on

...

  • the activity of the RTP end system's receiver's jitter buffer, and metrics for reporting "errored" and "severely errored" seconds.

For more information about

...

RTCP-XR, see RFC 5093

...

.

Dead Call Detection

...

Specifies whether or not to use RTCP-based Dead Call Detection (DCD).

DCD is accomplished by monitoring incoming RTCP packets. If this feature is enabled

...

and

...

no RTCP packets are received from the peer for

...

30 seconds, the call

...

is considered "dead"

...

and is disconnected.

...

Disable DCD for any peer that does not send RTCP packets.

Silence Suppression

...

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Specifies whether or not to use Voice Activity Detection and send PT13 packets when on.

  • If Silence Suppression is enabled, the 
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    monitors outgoing audio (towards the IP network).

...

  • Upon detecting silence

...

  • , voice packet transmission

...

  • ceases to save network bandwidth.

...

  • Enabling Silence Suppression saves network bandwidth

...

  • ; however, voice quality may be slightly degraded.
  • If Silence Suppression is disabled, voice packets are sent regardless of whether

...

  • audio is present.
 

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Gain Control - Field Definitions

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Set the gain control fields to manipulate gain or loss (in decibels)

...

for received

...

and transmitted signals.

...

With gain control, the negative values represent signal attenuation (lower volume)

...

and the positive values represent signal amplification (higher volume).

 

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Receive Gain

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Gain Control fields are not applicable for

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FieldDescription
 Receive Gain Specifies the gain or loss in decibels to apply to received signals. (Packet

...

→ PCM direction).

Transmit Gain

...

 Transmit GainSpecifies the gain or loss in decibels to apply to transmitted signals (

...

PCM  → Packet direction).
 

Passthrough/Tone Detection - Field Definitions

Modem Passthrough

...

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FieldDescription
Modem Passthrough

...

Specifies whether or not modem passthrough is enabled when using the G.711 codec.

If the user wants to support modem calls, this option should be Enabled. When Disabled, the 

Spacevars
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does not distinguish between voice and modem calls. When Enabled, and the 
Spacevars
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detects a modem call, it switches to Modem Passthrough mode (based on G.711 codec).

Fax Passthrough

...

...

Controls whether or not the 

Spacevars
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supports G.711 faxing.

  • If you wish to force fax calls to use G.711 (uLaw/aLaw) codec, then Fax Passthrough must be Enabled. Also, G.711 must be the only codec in the

...

  • Spacevars
    0product
    Media List. In this configuration, the 
    Spacevars
    0product
    will only offer/accept G.711 in the reINVITE.
  • If you wish to support both G.711 and T.38 faxing simultaneously, the Fax Passthrough must be Enabled, and the 
    Spacevars
    0product
    must be configured with both G.711 and T.38 codecs. Which faxing type is selected will depend upon the codecs offered/accepted in the reINVITE.
  • If you wish to force fax calls to use T.38 codec, configure the Fax Passthrough to Disable. The 
    Spacevars
    0product
    must be configured for both G.711 and T.38 codecs. In this configuration, the 
    Spacevars
    0product
    will only offer/accept T.38 in the reINVITE.

...

iconfalse

...

Note: If the fax destination offers only

...

T.38 in the reINVITE, then the 

Spacevars
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must be configured for both G.711 and T.38. As noted above, T.38 fax negotiation is possible

...

whether Fax Passthrough

...

set to

...

Enable or Disable.

CNG Tone Detection

...

Note: The CNG Tone Detection field is not applicable for

Spacevars
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.

Specifies whether or not the 

Spacevars
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...

detects Fax tones produced by the origination-side fax machine. CNG tone detection is

...

required when Fax calls are received from TDM

...

for a Fax server, and the voice call needs to be switched to a Fax call using T.38. If CNG tone detection is enabled, the 

Spacevars
0product
detects the Fax tone from TDM and switches to Fax mode (it will initiate a re-INVITE with T.38 support to the Fax Server). If CNG tone detection is disabled, the 
Spacevars
0product
will pass-through the Fax tones to the Fax server and the Fax server

...

must detect the tones and initiate a re-INVITE to switch to Fax mode with T.38.

Fax Tone Detection

...

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...

Specifies whether or not the 
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system will detect Fax tones produced by the terminating side fax machine. Fax tone detection(V.21 flags) is used when Fax calls are received from TDM to a Fax server and the voice call needs to be switched to a Fax call using T.38. If Fax tone detection is enabled, the 
Spacevars
0product
detects the Fax tone from TDM and switches to Fax mode (it will initiate a re-INVITE with T.38 support to the Fax Server). If Fax tone detection is disabled, the 
Spacevars
0product
will pass-through the Fax tones to the Fax server and the Fax server will have to detect them and initiate a re-INVITE to switch to Fax mode with T.38.

DTMF Signal to Noise

Note: The DTMF Signal to Noise field is not applicable for

Spacevars
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.

Sets the Signal to Noise Ratio that affects DTMF detection. Setting higher Signal-to-Noise ratio values reduces the chance of false detection; however, a setting can be too high for the amount of noise in an audio stream. Use this field to set a value in the range -3 dB to +6 dB. The default value for the field is 0 dBM.

DTMF Minimum Level

Note: The DTMF Minimum Level field is not applicable for

Spacevars
0product3
.

Sets the minimum signal level for DTMF detection; DTMF digits lower than the minimum are not detected. Valid entries: -48 to -14 dBm0. The default value of the field is -38 dBm0.

Digit Relay - Field Definitions

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FieldDescription
 Digit (DTMF) Relay Type

...

Specifies how DTMF digits are passed through the data network; as normal voice or encoded as specified in RFC 4733 (RFC 2833).

RFC 4733 (RFC 2833): When a DTMF digit is detected in the voice stream coming from the TDM side, the digit is removed from the voice stream (going to the IP network), and is sent out-of-band using the RFC 4733 (RFC 2833) mechanism.

As Voice: The DTMF digits are sent in the voice stream without any special treatment.

Digit Relay Payload Type

...

Specifies the payload type used for RFC 4733 (RFC 2833) packets. Available only when RFC 4733 (listed as RFC 2833) is specified for Relay Type.