Identifiers: Referencing Switching Domain Objects in Software

Creating QR Code ISO/IEC18004 in Software Identifiers: Referencing Switching Domain Objects

Identifiers are message parameters used to identify a particular resource or entity in the switching domain They allow the abstraction represented by the switching domain to be conveyed across the service boundary via messages

Device identifiers are parameters that refer to devices and device configurations Devices are referred to by address, so device identifier parameters contain device addresses in a device identifier format corresponding to one of the address formats described in 4, section 46 Device Roles A particular service request message or event message may contain many references to different devices Each of these devices has a different role with respect to the service desired or the event being reported

These device roles include: Called device identifier The called device identifier is the destination address specified for a particular call For an external incoming call, this parameter will contain DNIS information or the full DID number dialed Calling device identifier The calling device identifier is the device that originally placed a particular call For an external incoming call, this parameter will contain callerID or ANI information Associated called device identifier For an external outgoing call, the associated called device identifier parameter refers to the network interface device being used For an external incoming call, the associated called device identifier parameter refers to the device in the switching domain associated with the number originally called (eg, the attendant, DID extension, DISA extension, etc) If the call is not an external call, this parameter is not included in any messages Associated calling device identifier For an external incoming call, the associated calling device identifier parameter refers to the network interface device being used If the call is not an external call, this parameter is not included in any messages Redirection device identifier The redirection device identifier parameter refers to the last device from which this call was previously routed In addition to being Not Known (which means that the last redirection device is not visible), the redirection device identifier may be specified as Not Required to indicate that the call has not been redirected, or Not Specified to indicate that the switching domain doesn't know if the call has been redirected

Subject device identifier The subject device identifier parameter indicates the subject, or focus, of a particular event message Depending on the context, a particular device that must be referenced in an event message might not be visible within the switching domain Parameters referencing these devices have the value Not Known Addressable and Non addressable Appearances Specific appearances within a logical device element may be referenced explicitly if the appearances are addressable (Addressability of appearances is explained in 4, section 442) A device identifier containing explicit appearance references is formed using appearance suffixes (See the sidebar ''Switching Domain Representation Format" on page 195 in 4, section 465) Physical, Logical, Appearance, and Device Configuration References The interpretation of a device identifier parameter depends upon the value provided and the service request or event in which it appears In the case that a device identifier contains an appearance suffix (see 4, section 465), the context in which it is being used determines its interpretation If the context is one where an appearance reference is appropriate, it is used for this purpose; otherwise the parameter is treated as a reference to the appearance's logical device element If the device identifier is used in a context in which only a physical element reference is applicable, it is interpreted as being a reference to the physical element portion of the device specified Likewise, if the device identifier is used in a context in which only a logical element is applicable, the device identifier is interpreted as referring to the logical element portion of the device specified Otherwise, the device reference is interpreted as being the device configuration which has the device referenced as its base