Modem Tone Attributes

The following table describes the modem tone attribute, embedded under the Acme-Extended-Attributes-1 AVP.

Attribute Name Attribute Description Attribute Value Attribute Value Type Messages
Acme-Extended-Attributes-1 Indicates VBD modem tones that were detected on the call. 182 String

INTERIM

STOP

The attribute takes the following form:


type           = 26 (vendor-specific)
length         = ...
vendor-id      = 9148 (acme)
--VSA--
vendor-type    = 182 (Media-Interworking-Fields)
vendor-length  = ...    
vendor-data    = { x-attr-type (1 byte), x-attr-len (1 byte),  x-attr-data (version[1 byte], data) }
For example, if the value for a call is 0x0713014d6f64656d2d416e732d2f414e53616d, you should create a parser to break up the information as follows:
  • Type: 0x07
  • Length: 13
  • Version: 01
  • VBD Tone Name: 4d6f64656d2d416e732d2f414e53616d (Modem-Ans-/ANSam)

Supported modem tones are:

  • Modem-Ans-ANS
  • Modem-Ans-/ANS
  • Modem-Ans-ANSam
  • Modem-Ans-/ANSam
  • Modem-Ans-Bell103
  • Modem-Ans-V21High
  • Modem-Ans-V23High
  • Modem-Ans-V22
  • Modem-Ans-V22+1800Hz
  • Modem-Ans-V8bis
  • Modem-Ans-Baudot
  • Modem-Orig-Bell103
  • Modem-Orig-V21Low
  • Modem-Orig-V25Calling
  • Modem-Orig-V8bis
  • Modem-Orig-Baudot