Length Indicator
Explicit length indication makes switching easier
- Intermediate nodes do not need to deal with end-to-end parameters (e.g. payload format)
Variable size packets are common in mobile environment
- Adaptive Rate Codec (3G), GSM, CDMA and ITU codecs
- Comfort noise frames
- No correlation between successive mini packets in a RTP payload
Voice frames usually less than 32 bytes
Extensibility to allow larger payloads