This document describes the RTP payload format for Enhanced Variable Rate Codec (EVRC) Speech and Selectable Mode Vocoder (SMV) Speech. Two sub-formats are specified for different application scenarios. A bundled/interleaved format is included to reduce the effect of packet loss on speech quality and amortize the overhead of the RTP header over more than one speech frame. A non-bundled format is also supported for conversational applications.
This document specifies a real-time transport protocol (RTP) payload format to be used for Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB) encoded speech signals. The payload format is designed to be able to interoperate with existing AMR and AMR-WB transport formats on non-IP networks. In addition, a file format is specified for transport of AMR and AMR-WB speech data in storage mode applications such as email. Two separate MIME type registrations are included, one for AMR and one for AMR-WB, specifying use of both the RTP payload format and the storage format.
International Telecommunication Union (ITU-T) Recommendation G.722.1 is a wide-band audio codec, which operates at one of two selectable bit rates, 24kbit/s or 32kbit/s. This document describes the payload format for including G.722.1 generated bit streams within an RTP packet. Also included here are the necessary details for the use of G.722.1 with MIME and SDP. This document is a product of the Audio/Video Transport Working Group of the IETF.
This document specifies an RTP payload format for encapsulating European Telecommunications Standards Institute (ETSI) European Standard (ES) 201 108 front-end signal processing feature streams for distributed speech recognition (DSR) systems.
This document describes an RTP payload format for transporting AC-3 encoded audio data. AC-3 is a high quality multichannel audio coding system fully described in  by the Advanced Television Standards Committee (ATSC). The RTP payload format presented in this document provides mechanisms for interleaving redundant data, which can increase packet loss resilience. An intelligent method for fragmenting AC-3 frames that exceed the maximum transfer unit (MTU) is also described.
This document describes a Real-time Transport Protocol (RTP) payload format for transporting comfort noise (CN). The CN payload type is primarily for use with audio codecs that do not support comfort noise as part of the codec itself such as ITU-T Recommendations G.711, G.726, G.727, G.728, and G.722.
"Vendors fielding products which use payload type 13 as comfort noise, with the single octet payload, are in conformance with the spec as it currently stands. The spec may change in future to include a multi-octet comfort noise format, so vendors using the existing format should be prepared to ignore any additional octets. It is our intention that draft-ietf-avt-rtp-cn-?? will become the new standard for payload type 13. The draft is intended to be an extension of the existing single-octet comfort noise format - one of the main areas we are soliciting feedback is whether this modification to the format will cause problems to existing implementations (if so, we may have to modify our plans)."(Colin Perkins, 07/13/00)
This document describes a RTP (Real-Time Protocol) payload format for transporting MPEG (Moving Picture Experts Group) 1 or 2, layer III audio (commonly known as "MP3"). This format is an alternative to that described in RFC 2250, and performs better if there is packet loss.demonstration
This document specifies a packetization scheme for encapsulating 12-bit nonlinear, 20-bit linear, and 24-bit linear audio data streams using the Real-time Transport Protocol (RTP). This document also specifies the format of a Session Description Protocol (SDP) parameter to indicate when audio data is preemphasized before sampling. The parameter may be used with other audio payload formats, in particular L16 (16-bit linear).
This document specifies the packetization scheme for encapsulating the compressed digital video data streams commonly known as "DV" into a payload format for the Real-Time Transport Protocol (RTP).
Last updated by Henning Schulzrinne