IPMultimediaPDU.asn 4.51 KB
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IPMultimediaPDU 
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{itu-t(0) identified-organization(4) etsi(0) securityDomain(2) lawfulIntercept(2) li-ps(5) iPMultimedia(5) version5(5)}
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DEFINITIONS IMPLICIT TAGS ::=
BEGIN

IMPORTS
	-- from TS 101 671 [1]
	IPAddress
		FROM HI2Operations 
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		{itu-t(0) identified-organization(4) etsi(0) securityDomain(2) lawfulIntercept(2) hi2(1) version14(14)};
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-- ============================
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-- Object Identifier Definition
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-- ============================
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iPMMIRIObjId RELATIVE-OID			::= {li-ps(5) iPMultimedia(5) version5(5) iRI(1)}
iPMMCCObjId RELATIVE-OID			::= {li-ps(5) iPMultimedia(5) version5(5) cC(2)}
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	-- both definitions relative to: 
	-- {itu-t(0) identified-organization(4) etsi(0) securityDomain(2) lawfulIntercept(2)}

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

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IPMMCC ::= SEQUENCE
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{
	iPMMCCObjId 				[0] RELATIVE-OID,
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	mMCCContents				[1] OCTET STRING,
		-- Copy of the multimediastream, i.e. all related RTP/RTCP or MSRP packets
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		-- Each IPMMCC shall contain one intercepted packet
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		-- Protocol of the multimedia packets is indicated by means of mMCCprotocol parameter
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		-- mMCCContents was called rTPCCContents in earlier versions until v2.3.2.
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	...,
	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
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	streamIdentifier			[3] OCTET STRING OPTIONAL,
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		-- 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
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	mMCCprotocol				[4] MMCCprotocol OPTIONAL
		-- Used to identify the protocol of packets sent in MMCCContent (RTP, MSRP, etc.)
		-- Absence means mMCCContents contains RTP/RTCP packets
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}

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FrameType ::= ENUMERATED
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{
	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
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	...,
	tcpFrame(4)
		-- IP header is missing
}

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

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

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

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IPIRIContents ::= CHOICE
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{
	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
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	...,
	nationalIPMMIRIParameters	[3] NationalIPMMIRIParameters
		-- This parameter is used according to national regulations
		-- This parameter shall be delivered as an IRI-Report-record
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}

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

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

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

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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.
}
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END -- end of IP Multimedia PDU