PstnIsdnPDU.asn 3.61 KB
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-- ===============================
-- Description of the PstnIsdn PDU
-- ===============================

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PstnIsdnPDU
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{itu-t(0) identified-organization(4) etsi(0) securityDomain(2) lawfulIntercept(2) li-ps(5) pstnIsdn(6) version5(5)}
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DEFINITIONS IMPLICIT TAGS ::=
BEGIN

IMPORTS

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	-- from TS 102 232-01 [2]
	PayloadDirection
		FROM LI-PS-PDU
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		{itu-t(0) identified-organization(4) etsi(0) securityDomain(2) lawfulIntercept(2) li-ps(5) genHeader(1) version18(18)};
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-- ============================
-- Object Identifier Definition
-- ============================

	-- definitions are relative to
	-- {itu-t(0) identified-organization(4) etsi(0) securityDomain(2) lawfulintercept(2)}
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pstnIsdnIRIObjId RELATIVE-OID	::= {li-ps(5) pstnIsdn(6) version5(5) iRI(1)}
pstnIsdnCCObjId RELATIVE-OID	::= {li-ps(5) pstnIsdn(6) version5(5) cC(2)}
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-- ===============================
-- Description of the PstnIsdn IRI
-- ===============================

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PstnIsdnIRI ::= SEQUENCE
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{
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	pstnIsdnIRIObjId		[0] RELATIVE-OID,
	pstnIsdnIRIContents		[1] PstnIsdnIRIContents
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}

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PstnIsdnIRIContents ::= CHOICE
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{
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	supplementaryInfo		[0] SupplementaryInfo,
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	...
}

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SupplementaryInfo ::= SEQUENCE
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{
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	informationAppliesTo	[0] InformationAppliesTo,
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		-- Identifies the PDUs to which this info applies
	mediaFormat				[1] INTEGER (0..127),
		-- As defined in RFC 3551 [10]
	mediaAttributes			[2] OCTET STRING OPTIONAL,
		-- Format as per RFC 4566 [7]
		-- Clause 6.3 describes when the mediaAttributes shall be present
	encryptionKey			[3] OCTET STRING OPTIONAL,
		-- Format as per RFC 4566 [7]
	sessionName				[4] OCTET STRING OPTIONAL,
		-- Format as per RFC 4566 [7]
	sessionInfo				[5] OCTET STRING OPTIONAL,
		-- Format as per RFC 4566 [7]
	copyOfSDPMessage		[6] OCTET STRING OPTIONAL,
		-- Format as per RFC 4566 [7]
	...,
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	frameType				[7] FrameType OPTIONAL,
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		-- Populated if one or more protocol layers are missing from CC data
		-- May be omitted if all headers are present.
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	alternateProtocol		[8] AlternateProtocol OPTIONAL
		-- Used to identify the protocol of packets sent in pstnIsdnCCContents


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}

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InformationAppliesTo ::= SEQUENCE
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	-- Identifies the PDUs to which a piece of supplementary information applies
{
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	payloadDirection		[0] PayloadDirection,
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		-- The direction of the traffic to which this info applies
	cCLinkID				[1] INTEGER (0..65535) OPTIONAL,
		-- If there are multiple CCLinks, this field states CCLink to which this info applies
	firstPDUNumber			[2] INTEGER (0..4294967295) OPTIONAL,
		-- The supplementary info applies to all PDUs with this sequence number and above
	...
}

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FrameType ::= ENUMERATED
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{
	ipFrame(0),
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		-- All headers are present. Use AlternateProtocol to signal the contents if not RTP
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	udpFrame(1),
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		-- IP header is missing. Use AlternateProtocol to signal the contents if not RTP
	applicationFrame(2),
		-- UDP and IP headers are missing. Use AlternateProtocol to signal the contents if not RTP
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	audioFrame(3),
		-- All headers are missing
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	...,
	artificialRtpFrame(4)
		-- UDP and IP headers are missing, artificial RTP frame has been added
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}
AlternateProtocol ::= ENUMERATED
{
	uDPTL(1),
		-- pstnIsdnCCContents parameter contains UDPTL packets
	...
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}

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-- ==============================
-- Description of the PstnIsdn CC
-- ==============================

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PstnIsdnCC ::= SEQUENCE
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{
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	pstnIsdnCCObjId			[0] RELATIVE-OID,
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	pstnIsdnCCContents		[1] OCTET STRING,
		-- See clause 6.2 for definition of format of PstnIsdn CC
	cCLinkID				[2] INTEGER (0..65535) OPTIONAL,
		-- Shall be present if multiple CCLinks are used (see clause 6.3.4)
	...,
	supplementaryInfo		[3] SupplementaryInfo OPTIONAL
		-- Shall be present at least in the first PDU
}

END -- end of PstnIsdnPDU