As currently defined, RTP does not define any MECHANISMS for recovering for packet loss. Such mechanisms are likely to be highly dependent on the packet content. For example, for audio, it has been suggested to add low-bit-rate redundancy, offset in time. For other applications, RETRANSMISSION of LOST packets may be appropriate. (The H.261 RTP payload definition offers such a mechanism.) This requires no additions to RTP. RTP probably has the necessary header information (like sequence numbers) for some forms of error RECOVERY by retransmission.

As currently defined, RTP does not define any mechanisms for recovering for packet loss. Such mechanisms are likely to be highly dependent on the packet content. For example, for audio, it has been suggested to add low-bit-rate redundancy, offset in time. For other applications, retransmission of lost packets may be appropriate. (The H.261 RTP payload definition offers such a mechanism.) This requires no additions to RTP. RTP probably has the necessary header information (like sequence numbers) for some forms of error recovery by retransmission.