# Supported audio and video formats

Applications must use a single audio and video codec for the duration of each video call.

The following table presents the audio and video formats that are supported on both sides of the gateway:

Type | Format
PSTN audio | AMR-NB G.723-1
PSTN video | H.263 baseline level 10 H.263+ profile 3 level 10 H.264 baseline profile level 1 ISO/IEC 14496-2 MPEG-4 simple profile level 0
IP audio | AMR-NB over RFC 3267, as described below. G.723-1 G.711 Conformance with RFC 3267 is maintained in the following manner: Supported: Octet-aligned mode Not supported: Received Codec Mode Requests (CMR), forward error correction, interleaving, robust sorting, UEP/UED bit error detection schemes, multi-channel payloads
IP video | H.263 Baseline level 10 over RFC 2190 and RFC 2429 H.263+ profile 3 level 10 over RFC 2429 H.264 Baseline profile level 1 over RFC 3984, no interleaving MPEG-4 simple profile level 0 over RFC 3016

The 3G-324M Interface supports pass-through (no transcoding) of the following codecs:

- AMR narrow band audio, 3GPP TS 26.090 version 5.3, compliant with RFC 3267 for RTP packetization

- G.723.1 audio

- MPEG-4 simple profile level 0 video, compliant with RFC 3016 for RTP packetization

- H.263 baseline video, as specified in annex X (level 10), compliant with RFC 2429 and RFC 2190 for RTP packetization, with the exception of transmit support in mode B in RFC 2190

- H.263+ profile 3 level 10, compliant with RFC 2429 for RTP packetization

- H.264 baseline profile level 1 video, compliant with RFC 3984 for RTP packetization, without interleaving

Pass-through means that encoded frames received from the PSTN are H.223 demultiplexed, encapsulated in RTP-packets, and output over IP. No transcoding is performed on the frame payloads.

For data transferred from IP to PSTN, a jitter buffer function is provided on both audio and video streams.

When receiving the AMR NB codec from the PSTN interface, the audio logical channel of the H.223 MUX can optionally be transcoded to G.711 for transmission over IP.

Note: The application can convert AMR audio to codecs other than RTP G.711, at the expense of port density. Refer to CG board port densities in the readme-va.txt for more information. Refer to the Fusion Developer's Manual for a list of supported audio codecs on IP.