IPMultimediaPDU.asn

-- ====================================
-- Description of the IP Multimedia PDU
-- ====================================


IPMultimediaPDU 
{itu-t(0) identified-organization(4) etsi(0) securityDomain(2) lawfulIntercept(2) li-ps(5) iPMultimedia(5) version11(11)}

DEFINITIONS IMPLICIT TAGS ::=
BEGIN

IMPORTS
	-- from ETSI TS 102 232-1 [2]
    IPAddress,
	Location
		FROM LI-PS-PDU
		{itu-u(0) identified-organization(4) etsi(0) securityDomain(2) lawfulIntercept(2) li-ps(5) genHeader(1) version26(26)};



-- ============================
-- Object Identifier Definition
-- ============================

iPMMIRIObjId RELATIVE-OID			::= {li-ps(5) iPMultimedia(5) version11(11) iRI(1)}
iPMMCCObjId RELATIVE-OID			::= {li-ps(5) iPMultimedia(5) version11(11) 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,
	mMCCContents				[1] OCTET STRING,
		-- Copy of the multimediastream, i.e. all related RTP/RTCP, UDPTL or MSRP packets
		-- Each IPMMCC shall contain one intercepted packet
		-- Protocol of the multimedia packets is indicated by means of mMCCprotocol parameter
		-- mMCCContents was called rTPCCContents in earlier versions until v2.3.2.
	...,
	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
	mMCCprotocol				[4] MMCCprotocol OPTIONAL
		-- Used to identify the protocol of packets sent in MMCCContent (RTP, UDPTL, MSRP, etc.)
		-- Absence means mMCCContents contains RTP/RTCP packets
}

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
	...,
	tcpFrame(4),
		-- IP header is missing
	artificialRtpFrame(5),
		-- UDP and IP headers are missing, artificial RTP frame has been added
	udptlFrame(6),
		-- UDP and IP headers are missing
	msrpFrame(7)
		-- TCP and IP headers are missing

}

MMCCprotocol ::= ENUMERATED
{
	rTP(0),
		-- mMCCContents parameter contains RTP/RTCP packets
	mSRP(1),
		-- mMCCContents parameter contains MSRP packets
	...,
	uDPTL(2)
		-- mMCCContents parameter contains UDPTL packets
}

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

IPMMIRI ::= SEQUENCE
{
	iPMMIRIObjId				[0] RELATIVE-OID,
	iPMMIRIContents				[1] IPIRIContents,
	...,
	targetLocation				[2] Location OPTIONAL,
		-- This common parameter is defined in TS 102 232-1 [2], the use of this parameter is described in clause 5.2.3
	additionalSignalling		[3] SEQUENCE OF AdditionalSignalling OPTIONAL
		-- The use of this parameter is defined in clause 5.2.5
}

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
	...,
	nationalIPMMIRIParameters	[3] NationalIPMMIRIParameters,
		-- This parameter is used according to national regulations
		-- This parameter shall be delivered as an IRI-Report-record	
	xCAPMessage					[4] OCTET STRING		
		-- Copy of the XCAP message including all HTTP headers and contents
}

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,
	...
}

NationalIPMMIRIParameters ::= SEQUENCE
{
	countryCode					[1] PrintableString (SIZE (2)),
		-- Country Code according to ISO 3166-1 [16],
		-- the country to which the parameters inserted after the extension marker apply.
	...
	-- In case a given country wants to use additional national parameters according to its law,
	-- these national parameters should be defined using the ASN.1 syntax and added after the
	-- extension marker (...).
	-- It is recommended that "version parameter" and "vendor identification parameter" are
	-- included in the national parameters definition. Vendor identifications can be
	-- retrieved from the IANA web site (see Annex E Bibliography). Besides, it is recommended 
	-- to avoid using tags from 240 to 255 in a formal type definition.
}

AdditionalSignalling ::= CHOICE
{
	sipHeaderLine				[0] OCTET STRING,
		-- A SIP header line, eg: "Contact: tel:+123456789".
	...
}

END -- end of IPMultimediaPDU