User`s guide

96 Dialogic
®
1000 and 2000 Media Gateway Series User’s Guide
Parameter Reference
Allowed Values (Phone Emulating):
• None = The Media Gateway will not use RTP packets to transmit/receive tone information.
• RFC2833 = The (DTMF) tone information is sent between the Media Gateway and VoIP
endpoints via RTP packets as defined by RFC 2833.
Note: A payload type of 101 is used in the implementation of the RFC2833 method.
• RFC2833-LowLatency = Same as RFC2833, but with 20 milliseconds DTMF detection delay
removed. Selecting RFC2833-LowLatency may result in up to 20 milliseconds of DTMF
being leaked inband. This also applies to SIP-SIP calls that require transcoding.
Note: This is available on DMG2000 only.
• Inband-Tone = The DTMF tones are coded into the regular audio packets (RTP voice packets)
sent between the Media Gateway and VoIP endpoints.
Default Value = RFC2833
INI File Parameter Name = dspDigitRelay
Telephone-Event Payload Type
Description: Sets the dynamic Payload Type (PT) of the RTP header for telephone-event subtypes.
For an inbound call, if a PT is not specified, this is used as the default. This PT will always be
specified for the outbound call.
Note: Digit Relay Mode must be set to use RFC2833.
Allowed Values: 96 to 127
Default Value = 101
INI File Parameter Name = sipTelEventPayload
G722 Enable
Description: Enables support for G722 codec. If set to No, then G722 support is disabled. If set to
Yes, then G722 support is enabled.
Allowed Values:
• Yes = G722 support is enabled.
• No = G722 support is disabled.
Default Value = No
INI File Parameter Name = sipG722Enabled
Note: Unit requires a restart if this parameter value is changed.