String description |
II-digits is a 2-digit string that ISDN PRI provides for an incoming call. II-digits delivery is a widely available ISDN PRI AT&T Network service. This service is bundled with ANI delivery and tariffed under the MEGACOM 800® and MultiQuest 800® INFO-2 features to provide information on call origination. R2-MFC Call Category digits, when available, are treated as II-digits for routing. Leading zeros are significant. For example, the II-digits value 02 that is associated with a call does not match the digit string 2 in a vector step. |
Use with a VRT |
As is true for ANI routing and collected-digit routing, II-routing digits can be compared against entries in a Vector Routing Table. |
Use of wildcards |
The II-digits string used in a vector step or a vector routing table can contain either the + or ? wildcard. |
VDN Return Destination preservation |
When a call is returned to vector processing as a result of the VDN Return Destination feature, the II-digits are preserved. |
Call types associated with II-digits |
The following calls have associated II-digits values:
Note:
Since tandeming of II-digits is only supported if the trunk facilities used are ISDN PRI, traditional DCS does not support II-digits transport but DCS Plus, that is, DCS over PRI, supports II-digits transport.
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Internal transfer to a VDN |
When a call with II-digits is transferred internally to a VDN, the following outcomes can occur:
If the transfer completes before the call reaches the II-digits conditional, the II-digits value of the originator of the call is used. If the transfer completes after the call reaches the II-digits conditional, the II-digits value of the terminal executing the transfer is used. Under normal circumstances, there are no II-digits for a terminal that executes a transfer.
Tip:
To ensure that the originator II-digits is preserved, add a filler step such as wait with silence to the beginning of the vector. In this way, a transfer can be completed before the II-digits conditional is encountered.
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