1.	Compliance
Unsupported features are shown in red. 
Limitations are indicated in orange.
1.1	Fonctionnalités principales
•	ROHC compression 
•	ROHC decompression 
•	ROHC channels: small and large Channel IDs (CIDs) 
•	ROHC modes: 
o	Unidirectional mode (U-mode) 
o	Bidirectional Optimistic mode (O-mode) 
o	Bidirectional Reliable mode (R-mode) 
•	ROHC states: 
o	Initialization & Refresh (IR) 
o	First Order (FO) 
o	Second Order (SO) 
•	Feedback: 
o	Feedback packets 
o	Piggy-backed feedbacks 
o	Negative ACKs 
•	ROHC packets: 
o	Feedback packets (RFC 3095, §5.2.1 and §5.2.2) 
o	IR packet (RFC 3095, §5.2.3) 
•	Optional dynamic part is always sent 
o	IR-DYN packet (RFC 3095, §5.2.3) 
o	Packet type 0 (RFC 3095, §5.7.1) 
•	UO-0 
•	R-0 
•	R-0-CRC 
o	Packet type 1 for R-mode (RFC 3095, §5.7.2) 
•	R-1 
•	R-1-TS 
•	R-1-ID 
o	Packet type 1 for U/O-mode (RFC 3095, §5.7.3) 
•	UO-1 
•	UO-1-ID 
•	UO-1-TS 
o	Packet type 2 (RFC 3095, §5.7.4) 
•	UOR-2 
•	Actions upon CRC failure (RFC 3095, §5.3.2.2.3, §5.3.2.2.4 and §5.3.2.2.5) 
1.2	ROHC Profiles
•	Uncompressed (0x0000) 
•	RTP (0x0001) 
•	UDP (0x0002) 
•	ESP (0x0003) 
•	IP-only (0x0004) 
•	TCP (0x0006) 
•	UDP-Light (0x0008) 
1.3	Features common to all profiles
•	Compression of up to two IPv4/IPv6 headers 
•	Compressed IPv4 Header Extension List (RFC 3095, §5.8.4.1 & §5.8.5.1) 
•	Compressed IPv6 Header Extension List (RFC 3095, §5.8.4.1 & §5.8.5.1) 
•	Authentication Header (AH) Compression (RFC 3095, §5.8.4.2) 
•	Encapsulating Security Payload Header (ESP) Compression (RFC 3095, §5.8.4.3) 
•	GRE Header Compression (RFC 3095, §5.8.4.4) 
•	Forced context reinitialization controled by the user 
•	Fixed sizes parameters in order to specify the size of ROHC packets 
•	Optional Reverse decompression (RFC 3095, §6.1) 
•	ROHC segmentation (RFC 3095, §5.2.5) 
1.4	Features specific to a profile
Uncompressed 	  	
RTP 	•	Compressed CSRC List (RFC 3095, §5.8.5.2) 
•	Timer-based compression of RTP Timestamp (RFC 3095, §4.5.4) 	
UDP 	  	
IP-only 	•	more than 2 IPv4/IPv6 headers 	
UDP-Lite 	•	Checksum Coverage (CC) compression 	
1.5	Encoding schemes
•	Least Significant Bits (LSB) encoding (RFC 3095, §4.5.1) 
•	Window-based LSB (W-LSB) encoding (RFC 3095, §4.5.2) 
•	Scaled RTP Timestamp encoding (RFC 3095, §4.5.3) 
•	Timer-based compression of RTP Timestamp (RFC 3095, §4.5.4) 
•	Offset IP-ID encoding (RFC 3095, §4.5.5) 
•	Self-describing variable-length (SDVL) values (RFC 3095, §4.5.6) 
•	Encoded values across several fields in compressed headers (RFC 3095, §4.5.7) 
o	Not fully respected: if more bits than stricly necessary are available, more bits are sent