Page History

...

Gain Control Field Definitions

Passthrough/Tone Detection - Field Definitions

...

Passthrough/Tone Detection Field Definitions

Field	Description
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 0 product does not distinguish between voice and modem calls. When Enabled, and the  Spacevars 0 product detects a modem call, it switches to Modem Passthrough mode (based on G.711 codec).
Fax Passthrough	Controls whether or not the  Spacevars 0 product 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 0 product Media List. In this configuration, the  Spacevars 0 product 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 0 product 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 0 product must be configured for both G.711 and T.38 codecs. In this configuration, the  Spacevars 0 product will only offer/accept T.38 in the reINVITE. Note: If the fax destination offers only T.38 in the reINVITE, then the  Spacevars 0 product 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 0 product3 . Specifies whether or not the  Spacevars 0 product 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 0 product 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 0 product 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	Specifies whether or not the  Spacevars 0 product 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 0 product 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 0 product 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 0 product3 . 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 0 product3 . 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

...

Digit Relay Field Definitions

Field	Description
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.