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Describe the format of RTP and RTCP packets.The 32 bits of RTP packet format is as follows:- (L to R)
- Bit 0-1:- Indicates version, currently 2
- Bit 2:- P- indicates padding bytes
- Bit 3:- X- Indicates presence of extension header
- Bit 4-7:- CC- Contains number of CSRC identifiers that follows the header
- Bit 8:- M- Current data has some special relevance (if set)
- Bit 9-15:- PT- Indicates format of payload
- Bit 16-31:- Sequence number
- Timestamp: - 32bits – time stamp of packet
- SSRC- Synchronization source identifier uniquely identifies the source of a stream.
- CSRC -Contributing source IDs enumerate contributing sources to a stream which has been generated from multiple sources
- Extension header: - first 32 bit word contains profile specific identifier and length specifier
The 32 bits of RTCP header format is as follows:- (L to R)
- Bit 0-1:- Indicates version, currently 2
- Bit 2:- P- indicates padding bytes
- Bit 3 to 7:- Count of number of reception report blocks
- Bit 8 to 15:- Type: - Determined RTCP packet type. Type can take values from 0 to 255
- 16 to 31:- Length- Length of RTCP packet - 1
- SR: - Sender Report for transmission and reception from active senders
- RR: - Receiver report for reception from in active senders
- SDES: - Source description items
- BYE- indicates end of participation
- APP: - Application specific functions
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