ISDN Protocol Administrator's and Developer's Guide ... - Intervoice

Table 6-3 displays the Supplementary Information String (SIS)identifiers used by an Intervoice system running DPNSS 1.For more information on Supplementary Information String(SIS) identifiers, refer to BTNR 188 – Digital PrivateSignaling System No 1 (DPNSS 1).Table 6-3. Supplementary Information String IdentifiersSIS ID Mnemonic Name Parameters Description10B CBWF-R Call Back When Free– Request11B CBWF-FN Call Back When Free– Free Notification12B CBWF- CSUI Call Back When Free– Call Set-up(Immediate)13B CBWF-C Call Back When Free– Cancel16B CBWF-CSUD Call Back When Free– Call Set-Up(Delayed)NoneNoneNoneNoneNoneRegisters a CBWF – Request atthe terminating PBX.Notifies the originating PBXthat the called extension is nowfree.Indicates that the call beingestablished is a callback thathas been made immediatelyfollowing receipt of aCBWF-FN.Used when a calling partyrequests the cancellation of aCBWF.It is also used when a CBWF iscancelled because a time outexpires.Indicates that the call beingestablished is a callback thatwas delayed because the partywas busy when the CBWF-FNwas received.19 LA Loop Avoidance 1 Number ofFurther Transmits2 Number ofFurtherAlternativeRoutesConveys the number of transitPBXs through which a call maybe routed.Optionally, it provides thenumber of alternative routesthat the call may take.21 EI-R Executive Intrusion –RequestIntrusion CapabilityLevelUsed when a calling partywants to intrude on a party whois already on an establishedconnection.6-10 ISDN Protocol Administrator’s and Developer’s Guide 60001262, First Edition