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

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    1Create Media List

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

  • If Silence Suppression is enabled, the Sonus SBC 1000/2000 the 
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    monitors outgoing audio (towards the IP network). If silence is detected, voice packet transmission will cease to save network bandwidth. The enable setting saves network bandwidth, however, voice quality may be slightly degraded.
  • If Silence Suppression is disabled, voice packets are sent regardless of whether or not audio is present.

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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 Sonus SBC 1000/2000 the 

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does not distinguish between voice and modem calls. When Enabled, and the Sonus SBC 1000/2000 the 
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detects a modem call, it switches to Modem Passthrough mode (based on G.711 codec).

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Controls whether or not the Sonus SBC 1000/2000 the 

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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 Sonus SBC 1000/2000 Media List. In this configuration, the Sonus SBC 1000/2000 the 
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    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 Sonus SBC 1000/2000 the 
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    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. Sonus SBC 1000/2000 The 
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    must be configured for both G.711 and T.38 codecs. In this configuration, the Sonus SBC 1000/2000 the 
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    will only offer/accept T.38 in the reINVITE.
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If your fax destination only offers T.38 in the reINVITE, then the Sonus SBC 1000/2000 the 

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must be configured for both G.711 and T.38. As noted above, T.38 fax negotiation is possible with Fax Passthrough configured to either Enable or Disable.

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Specifies whether or not the Sonus SBC 1000/2000 system the 

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will detect Fax tones produced by the origination side fax machine. CNG tone detection 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 CNG tone detection is enabled, the 
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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 
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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.

Fax Tone Detection

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Specifies whether or not the Sonus SBC 1000/2000 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 

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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 Fax tone detection is disabled, Sonus SBC 1000/2000 the 
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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.

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