ebXMLメッセージサービスでは、アプリケーションの指示によって送信される通常のメッセージの他に、アプリケーションが関与せず、ebXMLメッセージサービスのレベルでのみ使用されるメッセージ（MSHレベルのメッセージ）を送受信する場合があります。ebMSでは以下の機会にMSHレベルのメッセージを利用します。
メッセージ受領通知を使用する場合
エラー通知メッセージを送受信する場合
これらのメッセージを送受信する条件は、PartyInfo要素のdefaultMshChannelId属性およびdefaultMshPackageId属性に記述するIDに対応する要素に従います。
<?xml version="1.0" encoding="UTF-8"?>
<tp:CollaborationProtocolAgreement
xmlns:tp="http://www.oasis-open.org/committees/ebxml-cppa/schema/cpp-cpa-2_0.xsd"
xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
xmlns:xlink="http://www.w3.org/1999/xlink"
tp:cpaid="FUJITSU_LIMITED-ebXML_Trader-20030115">
<tp:Status tp:value="agreed"/>
<tp:Start>2003-01-01T00:00:00Z</tp:Start>
<tp:End>2005-12-31T23:59:59Z</tp:End>
<tp:PartyInfo
tp:defaultMshChannelId="FUJITSU_LIMITED-deliveryChannel001"
tp:defaultMshPackageId="FUJITSU_LIMITED-package001">
<tp:PartyId tp:type=”Name”>FUJITSU_LIMITED</tp:PartyId>
<tp:CollaborationRole>
<tp:Role tp:name="urn:sample-service:Buyer"/>
<tp:ServiceBinding>
<tp:Service tp:type="anyURI">urn:sample-service:order-1</tp:Service>
<tp:CanSend>
<tp:ThisPartyActionBinding
tp:id=”Buyer-Order”
tp:action="Order"
tp:packageId="FUJITSU_LIMITED-package001">
<tp:BusinessTransactionCharacteristics
tp:isNonRepudiationRequired="false"/>
<tp:ChannelId>FUJITSU_LIMITED-deliveryChannel001</tp:ChannelId>
</tp:ThisPartyActionBinding>
<tp:OtherPartyActionBinding>Seller-Order</tp:OtherPartyActionBinding>
</tp:CanSend>
<tp:CanReceive>
<tp:ThisPartyActionBinding
tp:id=”Buyer-Order-Res”
tp:action="Order_Response"
tp:packageId="ebXML_Trader-package001">
<tp:BusinessTransactionCharacteristics
tp:isNonRepudiationRequired="false"/>
<tp:ChannelId>FUJITSU_LIMITED-deliveryChannel001</tp:ChannelId>
</tp:ThisPartyActionBinding>
<tp:OtherPartyActionBinding>Seller-Order-Res</tp:OtherPartyActionBinding>
</tp:CanReceive>
</tp:ServiceBinding>
</tp:CollaborationRole>
<tp:DeliveryChannel
tp:channelId="FUJITSU_LIMITED-deliveryChannel001"
tp:transportId="FUJITSU_LIMITED-transport001"
tp:docExchangeId="FUJITSU_LIMITED-docExchange001">
<tp:MessagingCharacteristics
tp:syncReplyMode="none"
tp:ackRequested="always"
tp:ackSignatureRequested="never"
tp:duplicateElimination="always"
tp:actor="urn:oasis:names:tc:ebxml-msg:actor:toPartyMSH"/>
</tp:DeliveryChannel>
<tp:Transport tp:transportId="FUJITSU_LIMITED-transport001">
<tp:TransportSender>
<tp:TransportProtocol>HTTP</tp:TransportProtocol>
</tp:TransportSender>
<tp:TransportReceiver>
<tp:TransportProtocol>HTTP</tp:TransportProtocol>
<tp:Endpoint
tp:uri="http://www.div001.fujitsu.com/ebms/servlet/ebxmlListener"
tp:type="allPurpose"/>
</tp:TransportReceiver>
</tp:Transport>
<tp:DocExchange tp:docExchangeId="FUJITSU_LIMITED-docExchange001">
<tp:ebXMLSenderBinding tp:version="2.0">
<tp:ReliableMessaging>
<tp:Retries>20</tp:Retries>
<tp:RetryInterval>PT50S</tp:RetryInterval>
<tp:MessageOrderSemantics>Guaranteed</tp:MessageOrderSemantics>
</tp:ReliableMessaging>
<tp:PersistDuration>P3D</tp:PersistDuration>
</tp:ebXMLSenderBinding>
<tp:ebXMLReceiverBinding tp:version="2.0">
<tp:ReliableMessaging>
<tp:Retries>10</tp:Retries>
<tp:RetryInterval>PT1M</tp:RetryInterval>
<tp:MessageOrderSemantics>Guaranteed</tp:MessageOrderSemantics>
</tp:ReliableMessaging>
<tp:PersistDuration>P3D</tp:PersistDuration>
</tp:ebXMLReceiverBinding>
</tp:DocExchange>
</tp:PartyInfo>
<tp:PartyInfo
tp:defaultMshChannelId="ebXML_Trader-deliveryChannel001"
tp:defaultMshPackageId="ebXML_Trader-package001">
<tp:PartyId tp:type=”Name”>ebXML_Trader</tp:PartyId>
<tp:CollaborationRole>
<tp:Role tp:name="urn:sample-service:Seller"/>
<tp:ServiceBinding>
<tp:Service tp:type="anyURI">urn:sample-service:order-1</tp:Service>
<tp:CanSend>
<tp:ThisPartyActionBinding
tp:id=”Seller-Order-Res”
tp:action="Order_Response"
tp:packageId="ebXML_Trader-package001">
<tp:BusinessTransactionCharacteristics
tp:isNonRepudiationRequired="false"/>
<tp:ChannelId>ebXML_Trader-deliveryChannel001</tp:ChannelId>
</tp:ThisPartyActionBinding>
<tp:OtherPartyActionBinding>Buyer-Order-Res<tp:OtherPartyActionBinding>
</tp:CanSend>
<tp:CanReceive>
<tp:ThisPartyActionBinding
tp:id=”Seller-Order”
tp:action="Order"
tp:packageId="FUJITSU_LIMITED-package001">
<tp:BusinessTransactionCharacteristics
tp:isNonRepudiationRequired="false"/>
<tp:ChannelId>ebXML_Trader-deliveryChannel001</tp:ChannelId>
</tp:ThisPartyActionBinding>
<tp:OtherPartyActionBinding>Buyer-Order</tp:OtherPartyActionBinding>
</tp:CanReceive>
</tp:ServiceBinding>
</tp:CollaborationRole>
<tp:DeliveryChannel
tp:channelId="ebXML_Trader-deliveryChannel001"
tp:transportId="ebXML_Trader-transport001"
tp:docExchangeId="ebXML_Trader-docExchange001">
<tp:MessagingCharacteristics
tp:syncReplyMode="none"
tp:ackRequested="always"
tp:ackSignatureRequested="never"
tp:duplicateElimination="always"
tp:actor="urn:oasis:names:tc:ebxml-msg:actor:toPartyMSH"/>
</tp:DeliveryChannel>
<tp:Transport tp:transportId="ebXML_Trader-transport001">
<tp:TransportSender>
<tp:TransportProtocol>HTTP</tp:TransportProtocol>
</tp:TransportSender>
<tp:TransportReceiver>
<tp:TransportProtocol>HTTP</tp:TransportProtocol>
<tp:Endpoint
tp:uri="http://www.ebXMLTrader.com/ebms/servlet/ebxmlListener"
tp:type="allPurpose"/>
</tp:TransportReceiver>
</tp:Transport>
<tp:DocExchange tp:docExchangeId="ebXML_Trader-docExchange001">
<tp:ebXMLSenderBinding tp:version="2.0">
<tp:ReliableMessaging>
<tp:Retries>10</tp:Retries>
<tp:RetryInterval>PT1M</tp:RetryInterval>
<tp:MessageOrderSemantics>Guaranteed</tp:MessageOrderSemantics>
</tp:ReliableMessaging>
<tp:PersistDuration>P3D</tp:PersistDuration>
</tp:ebXMLSenderBinding>
<tp:ebXMLReceiverBinding tp:version="2.0">
<tp:ReliableMessaging>
<tp:Retries>20</tp:Retries>
<tp:RetryInterval>PT50S</tp:RetryInterval>
<tp:MessageOrderSemantics>Guaranteed</tp:MessageOrderSemantics>
</tp:ReliableMessaging>
<tp:PersistDuration>P3D</tp:PersistDuration>
</tp:ebXMLReceiverBinding>
</tp:DocExchange>
</tp:PartyInfo>
<tp:Packaging tp:id="FUJITSU_LIMITED-package001"/>
<tp:Packaging tp:id="ebXML_Trader-package001"/>
</tp:CollaborationProtocolAgreement>以上で基本的なCPAは完成しました。以降の節では、このCPAをベースに、拡張機能を使用する場合のCPAの変更点について説明します。