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P-DCS-OSPS
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There are several situations in the PSTN where the operator provides a service from the operator services position (OSPS). This header supports three of those situations: busy line verification, emergency interrupt, and operator ringback.
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Busy line verification allows callers who are receiving a busy tone when dialing a number to have the operator verify that there is a conversation on the line (instead of a phone off hook). The operator effectively breaks into the line to determine if there is a conversation on the line,and reports the status back to the requestor. Emergency interrupt allows callers to request an operator to break into a conversation in progress and request that the parties release the line for an emergency incoming call. The operator can then connect the requesting party, or the requesting party can dial directly once the line is free. The operator ringback is used to ring back to an operator for additional assistance, either manually or automatically as part of an application. All three of these services would result in the generation of an INVITE containing this header. The values for this header are BLV, EI, and RING. The header is typically inserted into an INVITE sent over the OSPS trunk group by the media gateway controller (MGC) that is requesting the service. Only the BLV value can be sent in a new INVITE. Both EI and RING can only be sent in subsequent INVITEs related to a session in progress. The receiving UAS does not alert the parties involved in a session when the header is received with a value of BLV.
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P-DCS-Billing-Info
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This header is used to convey billing information provided by the proxies within a trusted domain. The header contains several parameters providing this data. The information is then used to provide billing systems with the necessary information for usage billing back to the billing system. Several identifiers are provided to direct the billing data to specific entities for recording. The parameters provided are
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Billing correlation ID (BCID) This parameter consists of four bytes of timestamp, an eight-byte network element identifier, eight bytes indicating the time zone, and a four-byte sequence number. The entire parameter is inserted into the header as a hexadecimal string. Financial entity ID (FEID) This is also a hexadecimal string identifying the financial entity to be used as the consumer of this data. The domain name is included after the @ symbol to indicate the domain for this billing. Record Keeping Server ID (RKSID) This parameter identifies the servers to be used for recording the usage data being provided in the header.
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The remaining parameters actually identify the usage itself and provide key account information. They all consist of E.164 numbers in the form of a TEL URI. These parameters are
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ACCT-CHARGE-URI This identifies the identity associated with the account to be billed for the usage recorded in the header. This is the equivalent to the charged number.
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ACCT-CALLING-URI This parameter provides the identity of the calling party. It is different than the ACCT-CHARGE-URI in that billing could be to a different account. This identifies the actual calling party number for the call. ACCT-CALLED-URI This identifies the called party for the session and is the equivalent to the called party. ACCT-ROUTING-URI This parameter identifies the routing number discovered during an LNP query. It is applicable only to U.S. networks where Local Number Portability (LNP) is implemented. Other countries use different number portability mechanisms. ACCT-LOCATION-ROUTING-URI This parameter provides the local routing number (LRN) discovered during an LNP query. It is applicable only to U.S. networks where Local Number Portability (LNP) is implemented using LRNs for routing.
The UAC generating a request creates these headers, populates them with the correct information, and sends them as part of the initial INVITE request to the terminating UAS. There will obviously be proxies along the path that will process different aspects of this header. For example, if the UAC is outside the trusted domain of the proxy, as would be the case for calls generated in another network, then the first proxy to receive the request would generate the header and all of its parameters, and forward the request to its destination. If that destination is in another network, then the last proxy in the trusted domain will be responsible for deleting the header prior to forwarding the message to the destination. In other words, there can never be a case where billing information is sent outside the trusted domain. The proxies send this billing information in the responses to a request as well, as long as the information stays within the trusted domain. The trusted domain, remember, can include other networks, as is the case with cable company federations. The proxies will use another interface (non-SIP) for the exchange of billing information to an actual billing system. The purpose of this header is to exchange billing information specific to the session with other proxies that will be sending billing data to the same billing entities.
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