Creating and Modifying Media Lists

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.

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

• 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.

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

• If Silence Suppression is Enabled, the SBC Edge Portfolio 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.

Specifies whether or not to force codec priority order as configured in the Media List.

• If Enforce SG Codec Priority is Enabled, the SBC SWe Edge forces codec priority order for both inbound and outbound calls.
• If Enforce SG Codec Priority is Disabled, the SBC SWe Edge uses codec priority order only for outbound calls. For inbound calls, the SBC SWe Edge continues to use the codec priority as received in the Session Description Protocol (SDP) offer. 

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

If you wish to support modem calls, enable this option. When Disabled, the SBC Edge Portfolio does not distinguish between voice and modem calls. When Enabled, and the SBC Edge Portfolio detects a modem call, it switches to Modem Passthrough mode (based on G.711 codec).

Controls whether or not the SBC Edge Portfolio 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 SBC Edge Portfolio Media List. In this configuration, the SBC Edge Portfolio will only offer/accept G.711 in the re-INVITE.

• If you wish to support both G.711 and T.38 faxing simultaneously, the Fax Passthrough must be Enabled, and the SBC Edge Portfolio 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 re-INVITE.
• If you wish to force fax calls to use T.38 codec, configure the Fax Passthrough to Disabled. The SBC Edge Portfolio must be configured for both G.711 and T.38 codecs. In this configuration, the SBC Edge Portfolio will only offer/accept T.38 in the re-INVITE.

Specifies whether or not the SBC Edge Portfolio 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 SBC Edge Portfolio 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 SBC Edge Portfolio will passthrough 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.

Specifies whether or not the SBC Edge Portfolio 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 SBC Edge Portfolio 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 SBC Edge Portfolio will passthrough 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.

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.

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.