IPMultimediaPDU 
{itu-t(0) identified-organization(4) etsi(0) securityDomain(2) lawfulIntercept(2) li-ps(5) iPMultimedia(5) version3(3)}

DEFINITIONS IMPLICIT TAGS ::=
BEGIN

IMPORTS
	-- from TS 101 671 [1]
	IPAddress
		FROM HI2Operations 
		{itu-t(0) identified-organization(4) etsi(0) securityDomain(2) lawfulIntercept(2) hi2(1) version10(10)};

-- Object Identifier Definition

iPMMIRIObjId RELATIVE-OID			::= {li-ps(5) iPMultimedia(5) version3(3) iRI(1)}
iPMMCCObjId RELATIVE-OID			::= {li-ps(5) iPMultimedia(5) version3(3) cC(2)}
	-- both definitions relative to: 
	-- {itu-t(0) identified-organization(4) etsi(0) securityDomain(2) lawfulIntercept(2)}

-- =====================================
-- IP Multimedia Communications Contents
-- =====================================

IPMMCC		::= SEQUENCE
{
	iPMMCCObjId 				[0] RELATIVE-OID,
	rTPCCContents				[1] OCTET STRING,
		-- Copy of the multimediastream, i.e. all related RTP and RTCP packets
	...,
	frameType					[2] FrameType OPTIONAL,
		-- The availability of header information shall be signalled with the frameType parameter
		-- The module is defined as OPTIONAL because of backwards compatibility reasons
		-- For new implementations the module is MANDATORY to be used as defined in clause 5.5
	streamIdentifier			[3] OCTET STRING OPTIONAL
		-- Used to identify the media stream within the current CIN, typically in case of 
		-- multiple media streams communications
		-- May be used to correlate each media stream with the relevant SDP media description of IRI
		-- May contain c= and m= lines extracts for instance
}

FrameType	::= ENUMERATED
{
	ipFrame(0),
		-- All headers are present
	udpFrame(1),
		-- IP header is missing
	rtpFrame(2),
		-- UDP and IP headers are missing
	audioFrame(3),
		-- All headers are missing
	...
}

-- ========================================================
-- Intercept-related information for IP Multimedia sessions
-- ========================================================

IPMMIRI			::= SEQUENCE
{
	iPMMIRIObjId 				[0] RELATIVE-OID,
	iPMMIRIContents				[1] IPIRIContents,
	...
}

IPIRIContents	::= CHOICE
{
	originalIPMMMessage			[0] OCTET STRING,
		-- Copy of the IP MM signalling packet including the original IP and UDP/TCP headers
	sIPMessage					[1] SIPMessage,
		-- Copy of the SIP content and the source and destination IP address
	h323Message					[2] H323Message,
		-- Copy of the H.323 content and the source and destination IP address
	...
	
}

SIPMessage		::= SEQUENCE
{
	iPSourceAddress 			[0] IPAddress,
	iPDestinationAddress		[1] IPAddress,
	sIPContent					[2] OCTET STRING,
	...
}

H323Message		::= SEQUENCE
{
	iPSourceAddress 			[0] IPAddress,
	iPDestinationAddress		[1] IPAddress,
	h323Content					[2] H323MessageContent,
	...
}

H323MessageContent		::= CHOICE
{
	h225CSMessageContent		[0] OCTET STRING,
	h225RASMessageContent		[1] OCTET STRING,
	h245MessageContent			[2] OCTET STRING,
	genericMessageContent		[3] OCTET STRING,
	...
}

END -- end of IP Multimedia PDU