Reference9:Media (Codecs)

For different types of media data a number of different codecs and other protocols are available on innovaphone product. The different codecs/protocols have different properties by their definition, but there are also depending on the product implementation specifics.

Supported Codecs/Protocols

Speech/Audio

G711A/u

Uncompressed Audio as used in tradition circuit switched telephone networks, with a payload bitrate of 64 kBit/s

G729A

Compressed Voice coder with a payload bit rate of 8 kBit/s. Moderate Voice quality compareable to analog phone lines

G723

Compressed Voice coder with a payload bitrate of 5.3 or 6.3 kBit/s. Low quality

G726 (ADPCM)

Deprecated low complexity coder with medium bitrate and low quality

G722

Wideband Voice coder with a payload bit rate of 64 kBit/s

Data

Transparent

Used for "unrestricted digital information" ISDN calls on IP. This coder is selected automatically based on the Bearer Capability of the call. Only used on Gateways with ISDN interfaces.

Fax

T.38

Fax Modem signals are translated to a binary protocol. This way the communication is more robust to packet loss or jitter compared to sending the modem signals as uncompressed audio.

Audio Processing

Line Echo Canceller

Used to cancel echo originating from analog lines or in the receiver of a phone. An important property is the length of the cancelled echo tail in ms.

Accoustic Echo Canceller

On the phone esspecially for hands free operation an accoustic echo canceller is used.

RTP Parameters

Packtization

The length of audio transmitted in a single packet.

Jitter Buffer

Buffer on the receiving side to compensate for variable delay. The jitter buffer starts with an initial value and implements a minimum and a maximumn

innovaphone Platforms

Generation 1 Gateways

Products

IP400, IP3000, IP21

Codec Implementation

Audiocodes AC481x family

Media

G.711, G.729A, G.723, T.38, Transparent

Echo Canceller

32ms

Packetization

20ms ... 200ms

Jitter Buffer

starts with configured packetization, Minimum is 10ms and Maximumum is 1000ms, above Packetization + 10ms the size is adapted

Generation 2 Gateways

Products

IP800, IP2000, IP6000

Codec Implementation

Audiocodes AC486x family

Media

G.711, G.729A, G.723, T.38, Transparent

Echo Canceller

64ms

Packetization

20ms ... 80ms

Jitter Buffer

starts with configured packetization, Minimum is 10ms and Maximumum is 1000ms, above Packetization + 10ms the size is adapted

Generation 3 Gateways

Products

IP810, IP0010, IP3010, IP6010, IP1060, IP22/24/28, IP30x IP38

Codec Implementation

Audiocodes AC49x family

Media

G.711, G.729A, G.723 (all except IP28/38), T.38, Transparent

Echo Canceller

64ms

Packetization

20ms ... 80ms, 20ms ... 60ms for G711

Jitter Buffer

starts with configured packetization, Minimum is 35ms and Maximumum is 300ms

Modemsupport

Automatic modem detect. The jitter buffer is fixed and the echo canceller is disabled if a modem is detected.

Old Phones

Products

IP200

Codec Implementation

Audiocodes AC481x family, Infineon Arcofi

Inca Phones

Products

IP110, IP200A, IP230, IP240

Codec Implementation

Infineon Inca1

Media

G.711, G.729A, G.723, Transparent

Echo Canceller

Accoustic

Packetization

20ms ... 80ms

Jitter Buffer

starts with configured packetization, Minimum is 10ms and Maximumum is 1000ms, above Packetization + 10ms the size is adapted

Orchid Phones

Products

IP241, IP222, IP232

Codec Implementation

Audiocodes AC49x family

Media

G.711, G.729A, G.723, G.722, Transparent

Echo Canceller

Accoustic

Packetization

20ms ... 80ms, 20ms ... 60ms for G711

Jitter Buffer

starts with configured packetization, Minimum is 35ms and Maximumum is 300ms?