4.4.4. Setting Coder Information

Terminal capabilities are exchanged during call establishment. The terminal capabilities are sent to the remote side as notification of coder supported.

Table 6 shows the coders that are supported when using the Global Call API with Intel® NetStructure IPT boards.

Table 6. Coders Supported for Intel® NetStructure IPT Boards 

Coder and Rate	Global Call # Define	Frames Per Packet (fpp) or Frame Size (ms)	VAD Support
G.711ALaw	GCCAP_AUDIO_g711Alaw64k	Frame Size: 10, 20, and 30 ms(Frames Per Packet: Fixed at 1 fpp)	Not supported
G.711ULaw	GCCAP_AUDIO_g711Ulaw64k	Frame Size: 10, 20, and 30 ms(Frames Per Packet: Fixed at 1 fpp)	Not supported
G.723.1 5.3 Kbps	GCCAP_AUDIO_g7231_5_3k	Frames Per Packet: 1, 2, 3 or 4(Frame Size: Fixed at 30 ms)	Supported
G.723.1, 6.3 Kbps	GCCAP_AUDIO_g7231_6_3k	Frames Per Packet: 1, 2, 3 or 4(Frame Size: Fixed at 30 ms)	Supported
G.729 or G.729a	GCCAP_AUDIO_g729AnnexA	Frames Per Packet: 1, 2, 3, or 4(Frame Size: Fixed at 30 ms)	Not applicable
G.729b or G.729a+b	GCCAP_AUDIO_g729AnnexAwAnnexB	Frames Per Packet: 1, 2, 3, or 4(Frame Size: Fixed at 30 ms)	Supported
T.38	GCCAP_DATA_t38UDPFax	Not applicable	Not applicable
Notes: 1. For G.711 coders, the frame size value (not the frames per packet value) is specified in the frames_per_pkt field of the IP_AUDIO_CAPABILITY structure. See Section 7.3, IP_AUDIO_CAPABILITY for more information. 2. Intel® NetStructure IPT boards support symmetrical coder definitions only, that is, the transmit and receive coder definitions must be the same.

Table 7 shows the coders that are supported when using the Global Call API with Intel® NetStructure DM/IP boards.

Table 7. Coders Supported for Intel® NetStructure DM/IP Boards 

Coder and Rate	Global Call # Define	Frames Per Packet (fpp) or Frame Size (ms)	VAD Support
G.711 ALaw	GCCAP_AUDIO_g711Alaw64k	Frame Size: 10, 20 or 30 ms(Frames Per Packet: Fixed at 1 fpp)	Not applicable
G.711 ULaw	GCCAP_AUDIO_g711Ulaw64k	Frame Size: 10, 20 or 30 ms(Frames Per Packet: Fixed at 1 fpp)	Not applicable
G.723.1 5.3 Kbps	GCCAP_AUDIO_g7231_5_3k	Frames Per Packet: 1, 2 or 3(Frame Size: Fixed at 30 ms)	Supported
G.723.1, 6.3 Kbps	GCCAP_AUDIO_g7231_6_3k	Frames Per Packet: 1, 2 or 3(Frame Size: Fixed at 30 ms)	Supported
G.729 or G.729a	GCCAP_AUDIO_g729AnnexA	Frames Per Packet: 1, 2, 3 or 4(Frame Size: Fixed at 10 ms)	Not applicable
G.729b or G.729a+b	GCCAP_AUDIO_g729AnnexAwAnnexB	Frames Per Packet: 3 or 4(Frame Size: Fixed at 10 ms)	Supported
GSM Full Rate (TIPHON)	GCCAP_AUDIO_gsmFullRate	Frames Per Packet: 1, 2 or 3(Frame Size: Fixed at 20 ms)	Disabled (default) orEnabled
T.38	GCCAP_DATA_t38UDPFax	Not applicable	Not applicable
Notes: 1. For G.711 coders, the frame size value (not the frames per packet value) is specified in the frames_per_pkt field of the IP_AUDIO_CAPABILITY structure. See Section 7.3, IP_AUDIO_CAPABILITY for more information. 2. GSM Telecommunications and Internet Protocol Harmonization over Networks (TIPHON) is a sub-group of the European Telecommunications Standards Institute (ETSI) GSM specification. 3. Intel® NetStructure DM/IP boards support G.726 play and record functionality only. Transcoding using G.726 is not supported. 4. GCCAP_dontCare can be used to indicate that any supported coder is valid.

Intel® NetStructure Host Media Processing (HMP) software performs voice, conferencing and IVR processing on general-purpose servers based on Intel® architecture without the use of specialized hardware. Table 8 shows the coders that are supported when using the Global Call API with HMP.

Table 8. Coders Supported for Host Media Processing (HMP) 

Coder and Rate	Global Call # Define	Frames Per Packet (fpp) or Frame Size (ms)	VAD Support
G.711ALaw	GCCAP_AUDIO_g711Alaw64k	Frame Size: 10, 20, and 30 ms(Frames Per Packet: Fixed at 1 fpp)	Not applicable
G.711ULaw	GCCAP_AUDIO_g711Ulaw64k	Frame Size: 10, 20, and 30 ms(Frames Per Packet: Fixed at 1 fpp)	Not applicable
Note: For G.711 coders, the frame size value (not the frames per packet value) is specified in the frames_per_pkt field of the IP_AUDIO_CAPABILITY structure. See Section 7.3, IP_AUDIO_CAPABILITY for more information.

Coder information can be set in the following ways:

• On a system wide basis using gc_SetConfigData( ).
• On a per line device basis using gc_SetUserInfo( ) with a duration parameter value of GC_ALLCALLS.
• On a per call basis using gc_MakeCall( ) or gc_SetUserInfo( ) with a duration parameter value of GC_SINGLECALL.

In each case, the following parameter set ID and parameter IDs are used to set up a GC_PARM_BLK containing the coder information:

• GCSET_CHAN_CAPABILITY
  • IPPARM_LOCAL_CAPABILITY - a parameter of type IP_CAPABILITY

Possible values for fields in the IP_CAPABILITY structure are:

• capability - One of the following:
  • GCCAP_AUDIO_g711Alaw64k
  • GCCAP_AUDIO_g711Ulaw64k
  • GCCAP_AUDIO_g7231_5_3k (at 5.3 kbits/s)
  • GCCAP_AUDIO_g7231_6_3k (at 6.3 kbits/s)
  • GCCAP_AUDIO_g729AnnexA
  • GCCAP_AUDIO_gsmFullRate
  • GCCAP_DATA_t38UDPFax
  • GCCAP_dontCare
• type - One of the following:
  • GCCAPTYPE_AUDIO
  • GCCAPTYPE_RDATA
• direction - One of the following:
  • IP_CAP_DIR_LCLTRANSMIT - transmit capability
  • IP_CAP_DIR_LCLRECEIVE - receive capability
  • IP_CAP_DIR_LCLRXTX - transmit and receive capability (T.38 only)

  Note: It is recommended to specify both the transmit and receive capabilities.

• payload_type - Not supported.
• extra - Must be of type IP_AUDIO_CAPABILITY.
  • extra.frames_per_packet - The number of frames per packet.

  Note: For G.711 coders, this field is the frame size (in ms).

  • extra.VAD - 0 (disabled) or 1 (enabled)

See Section 7.4, IP_CAPABILITY for more information.

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