Fax and Modem Parameters

Determines the fax transport mode used by the device.

Note: The parameter is overridden by the parameter [IsFaxUsed]. If the parameter [IsFaxUsed] is set to 1 (T.38 Relay) or 3 (Fax Fallback), then [FaxTransportMode] is always set to 1 (T.38 relay).

Determines the V.34 fax transport method (whether V34 fax falls back to T.30 or pass over Bypass).

Note: To configure [V34FaxTransportType] to [1] (i.e., fax relay), you also need to configure [FaxTransportMode] to [1] (fax relay).

Determines the V.21 modem transport type.

Note: You can also configure this feature per specific calls, using IP Profiles ('Vxx Modem Transport Type' parameter). For more information, see Configuring IP Profiles.

Determines the V.22 modem transport type.

Note: You can also configure this feature per specific calls, using IP Profiles ('Vxx Modem Transport Type' parameter). For more information, see Configuring IP Profiles.

Determines the V.23 modem transport type.

Note: You can also configure this feature per specific calls, using IP Profiles ('Vxx Modem Transport Type' parameter). For more information, see Configuring IP Profiles.

Determines the V.32 modem transport type.

Note:

Determines the V.90/V.34 modem transport type.

Note: You can also configure this feature per specific calls, using IP Profiles ('Vxx Modem Transport Type' parameter). For more information, see Configuring IP Profiles.

Determines the Bell modem transport method.

Determines the device's handling of fax relay upon detection of a fax CNG tone or a V.34/Super G3 V8-CM (Call Menu) signal from originating faxes.

Note:

Global parameter that enables the detection of the fax calling tone (CNG) and defines the detection method. You can also configure this feature per specific calls, using IP Profiles ('CNG Detector Mode' parameter). For a detailed description of the parameter and for configuring this feature in the IP Profiles table, see Configuring IP Profiles.

Note: If you configure this feature for a specific IP Profile, the device ignores this global parameter for calls associated with the IP Profile.

Defines a timeout (in msec) for detecting fax from the Tel side during an established voice call. The interval starts from when the voice call is established. If the device detects a fax tone within the interval, it ends the voice session and sends a T.38 or VBD re-INVITE message to the IP side and processes the fax. If the interval expires without any received fax event, the device ignores all subsequent fax events during the voice session.

The valid value is 0 to 120000. The default is 0. If set to 0, the device can detect fax during the entire voice call.

Note: The parameter is applicable only to the Gateway application.

Defines the T.38 fax relay version.

Note:

Defines the received T.38 over RTP payload type.

The valid range is 96 to 127. The default is 106.

Note: The device ignores this parameter for Rx payload types and uses the payload type determined during SDP negotiation. For using this configured payload type, see the [BackwardPTBehavior] parameter.

Defines the number of times that control packets are retransmitted when using the T.38 standard.

The valid range is 0 to 4. The default is 2.

Defines the number of times that each fax relay payload is retransmitted to the network.

Note: The parameter is applicable only to non-V.21 packets.

Defines the maximum rate (in bps) at which fax relay messages are transmitted (outgoing calls).

Note:

Enables Error Correction Mode (ECM) mode during fax relay.

Determines the coder used by the device when performing fax/modem bypass. Typically, high-bit-rate coders such as G.711 should be used.

Determines whether the device sends RFC 2833 ANS/ANSam events upon detection of fax and/or modem Answer tones (i.e., CED tone).

Note: The parameter is applicable only when the fax or modem transport type is set to bypass or Transparent-with-Events.

Defines the fax bypass RTP dynamic payload type.

The valid range is 0 to 127. The default is 102.

Note: The device ignores this parameter for Rx payload types and uses the payload type determined during SDP negotiation. For using this configured payload type, see the [BackwardPTBehavior] parameter.

Defines the modem bypass dynamic payload type.

The range is 0 to 127. The default is 103.

Note: The device ignores this parameter for Rx payload types and uses the payload type determined during SDP negotiation. For using this configured payload type, see the [BackwardPTBehavior] parameter.

Defines the fax gain control.

The range is -18 to -3, corresponding to -18 dBm to -3 dBm in 1-dB steps. The default is -6 dBm fax gain control.

Defines the fax bypass output gain control.

The range is -31 to +31 dB, in 1-dB steps. The default is 0 (i.e., no gain).

Defines the modem bypass output gain control.

The range is -31 dB to +31 dB, in 1-dB steps. The default is 0 (i.e., no gain).

Defines the basic frame size used during fax/modem bypass sessions.

Note: When set to 5 msec (1), the maximum number of simultaneous channels supported is 120.

Defines the Jitter Buffer delay (in milliseconds) during fax and modem bypass session.

The range is 0 to 150 msec. The default is 40.

Enables in-band network detection related to fax/modem.

Global parameter that enables Cisco's compatible fax and modem bypass mode, Named Signaling Event (NSE) packets. You can also configure this feature per specific calls, using IP Profiles ('NSE Mode' parameter). For a detailed description of the parameter and for configuring this feature in the IP Profiles table, see Configuring IP Profiles.

Note: If you configure this feature for a specific IP Profile, the device ignores this global parameter for calls associated with the IP Profile.

Defines the NSE payload type for Cisco Bypass compatible mode.

The valid range is 96-127. The default is 105.

Note:

Defines the maximum size of a T.38 datagram that the device can receive. This value is included in the outgoing SDP when T.38 is used.

The valid range is 120 to 600. The default is 560 .

Determines when the device initiates a T.38 session for fax transmission.

Note: The parameters is applicable only if the [IsFaxUsed] parameter is set to 1 (T.38 Relay) or 3 (Fax Fallback).

Defines the method for sending fax/modem CED (answering) tones.