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Sub-Field 1

Network Type (one character):

• C – Circuit Network
• P – Packet Network

Sub-Field 2

Codec Type (two numeric digits):

• 0 – PKT_ENCODING_NULL
• 1 – PKT_ENCODING_G711
• 2 – PKT_ENCODING_G711_SILENCE_SUPPRESS
• 3 – PKT_ENCODING_G723
• 4 – PKT_ENCODING_G729A
• 5 – PKT_ENCODING_G729AB
• 6 – PKT_ENCODING_FAX_RELAY
• 7 – PKT_ENCODING_G723A
• 8 – PKT_ENCODING_G726
• 9 – PKT_ENCODING_ILBC
• 10 – PKT_ENCODING_ILBCSS
• 11 – PKT_ENCODING_G722
• 12 – PKT_ENCODING_G722_SILENCE_SUPPRESS
• 13 – PKT_ENCODING_G7221
• 14 – PKT_ENCODING_G7221_SILENCE_SUPPRESS
• 15 – PKT_ENCODING_G728
• 16 – PKT_ENCODING_G728_SILENCE_SUPPRESS
• 17 – PKT_ENCODING_AMR Bandwidth-efficient Mode
• 18 – PKT_ENCODING_AMR Octet-align Mode
• 19 – PKT_ENCODING_AMR/CRC
• 20 – PKT_ENCODING_AMR/CRC/Interleaving
• 21 – PKT_ENCODING_AMR/CRC/Robust-sorting
• 22 – PKT_ENCODING_AMR/CRC/Interleaving/Robust-sorting
• 23 – PKT_ENCODING_AMR/Interleaving
• 24 – PKT_ENCODING_AMR/Interleaving/Robust-sorting
• 25 – PKT_ENCODING_AMR/Robust-sorting
• 26 – PKT_ENCODING_AMRWB/BW Efficient
• 27 – PKT_ENCODING_AMRWB Octet-align Mode
• 28 – PKT_ENCODING_AMRWB/CRC
• 29 – PKT_ENCODING_AMRWB/CRC/Interleaving
• 30 – PKT_ENCODING_AMRWB/CRC/Robust-sorting
• 31 – PKT_ENCODING_AMRWB/CRC/Interleaving/Robust-sorting
• 32 – PKT_ENCODING_AMRWB/Interleaving
• 33 – PKT_ENCODING_AMRWB/Interleaving/Robust-sorting
• 34 – PKT_ENCODING_AMRWB/Robust-sorting
• 35 – PKT_ENCODING_EVRC Interleaved/Bundled format
• 36 – PKT_ENCODING_EVRC0 Header-free format
• 37 – PKT_ENCODING_EVRC1 Compact-bundled format, Half-rate in single rate mode
• 38 – PKT_ENCODING_EVRC1_FR_Compact-bundled format, Full-rate in single rate mode
• 39 – PKT_ENCODING_EVRCB Interleaved/Bundled format
• 40 – PKT_ENCODING_EVRCB0 Header-free format
• 41 – PKT_ENCODING_EVRCB1 Compact-bundled Format, Half-rate in single rate operation
• 42 – PKT_ENCODING_EVRCB1_FR Compact-bundled format, Full-Rate in single rate operation
• 43 – PKT_ENCODING_EFR
• 44 – PKT_ENCODING_REVERSE_OFFER_WILDCARD
• 45 – (not used)
• 46 – PKT_ENCODING_G726SS

Sub-Field 3

G711 Audio Encoding Types (these one digit values apply only when the Codec Type is G711 or G711_SILENCE_SUPPRESS):

• 0 – CKT_ENCODING_NULL
• 1 – CKT_ENCODING_G711_ULAW
• 2 – CKT_ENCODING_G711_ALAW
  
  G723 Audio Encoding Type (these one digit values apply only when the Codec Type is G723 or G723A):
• 0 – G723_CODING_RATE_5P3_KBPS (5.3K bits per second)
• 1 – G723_CODING_RATE_6P3_KBPS (6.3K bits per second)
  
  G726 Audio Encoding Type (this one digit value applies only when the Codec Type is G726 or G726SS):
• 0 – G726_CODING_RATE_16KBPS
• 1 – G726_CODING_RATE_24KBPS
• 2 – G726_CODING_RATE_32KBPS
• 3 – G726_CODING_RATE_48KBPS
  
  ILBC Audio Encoding Type (these one digit values apply only when the Codec Type is ILBC and ILBCSS):
• 0 – ILBC_CODING_RATE_13P3_KBPS
• 1 – ILBC_CODING_RATE_15P2_KBPS
  Sub-Field 3 is not applicable (treated as "don't care") for Code Types NULL, G729A, G729AB, and FAX_RELAY)