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Page 1486 of 1536 Appendix B — Basic and Network Alternate Route Selection (BARS/NARS) 1 + dialing Network control Translation tables With 1+ dialing, the BARS or NARS translation tables are equipped for 4-digit translation (based on the first 1, 2, 3, or 4 digits), or 11-digit translation with X11 release 8 on, thus allowing BARS or NARS access code for long distance calls. NARS provides two translation tables and BARS provides one. Refer to Table 71 for dialing formats for NARS Uniform dialing plan (UDP) calls and Table 72 for BARS calls. Code ambiguity The 1+ dialing capability also eliminates ambiguity between identical originating and terminating 3-digit NPA, NXX and LOC codes for BARS or NARS-originated calls. Thus, the BARS or NARS customer can route calls to any NPA, NXX or LOC code that conflicts with one of his 3-digit codes. Limitation If 1+ dialing is specified for an NPA, NXX or SPN number in a translator, the digit "1" must not be used as the leading digit for Network Speed Call list codes in that translator. Network control is an enhancement to the Network Class of Service (NCOS) feature that extends NCOS controls to users located at an SL-1 Main. Network control requires that the SL-1 Main and serving SL-1 Node be equipped with the NSIG feature. The SL-1 Main must also be equipped with the NCOS feature. SL-1 Main NCOS Users (lines, trunks, attendants) at an SL-1 Main are assigned an NCOS that is used to determine their level of access to network facilities at the serving SL-1 Node. When a user at an SL-1 Main initiates a call to (or through) an SL-1 node, the user's assigned NCOS or TCOS, depending on Tie trunk settings (ESN or ESN2, for example), can be transmitted. If the user's NCOS is transmitted to the serving node and the node is equipped with BARS, only NCOS 0 through 7 can be assigned at the node. Therefore, only NCOS 0 through 7 should be assigned at the ESN Main even though an ESN Main equipped with NSIG can have an NCOS of 0 through 15. If the node is equipped with NARS, then an NCOS of 0 through 15 can be assigned both at the node and at the ESN Main. 553-3011-315 Standard 10.0 May 1999
Appendix B — Basic and Network Alternate Route Selection (BARS/NARS) Page 1487 of 1536 The transmitted NCOS or TCOS overrides the NCOS or FRL assigned to the incoming Tie trunk group at the node, and is used to determine the user's eligibility for network resources/features at the SL-1 Node. Thus, a user at an SL-1 Main has the same network-access capabilities as a user at the SL-1 Node who is assigned the same NCOS. If the user at the SL-1 Main enters a valid authorization code prior to placing a BARS or NARS call, the NCOS associated with the authorization code is transmitted to the SL-1 Node in place of the user's assigned NCOS. Calls from a Conventional Main to the SL-1 Node are controlled by the NCOS assigned to the incoming trunk group at the SL-1 Node, since the Conventional Main has no NSIG. SL-1 node TCOS Network Control at an SL-1 node can provide a Traveling Class of Service (TCOS) mechanism. TCOS controls route access and Off-Hook Queuing (OHQ) eligibility for calls placed to (or through) another SL-1 node or an associated SL-1 Main. It also enables the SL-1 Node to interface with switches that are part of an Electronic Tie Network (ETN) as long as the SIGO setting on the Tie trunk route is set for ETN at both ends. Nodes can send NCOS if SIGO is set for ESN2, for example, at both ends of the Tie trunk group. The Traveling Class of Service is, in effect, the Facility Restrictions Level (FRL) of a user's assigned NCOS. When a user at an SL-1 node initiates a call to another SL-1 Node (or an SL-1 ESN Main), the TCOS (for example, the FRL of the user's assigned NCOS) is transmitted to the other SL-1 Node. At the receiving SL-1 Node, the TCOS (0-7) replaces the FRL of the NCOS assigned to the incoming trunk group. Route access and OHQ eligibility for the call are, therefore, based on the NCOS of the incoming trunk group with the modified FRL (for example, TCOS). The Network Control (NCTL) data block (LD87) is used to define OHQ eligibility on a per FRL (TCOS) basis (for example, if FRL 4 is defined as OHQ eligible, then all users with an NCOS with an FRL of 4 are eligible for OHQ on calls placed to another SL-1 Node or to an associated SL-1 Main). Option 11C 2.0 Mb DTI/PRI Administration and Maintenance guide
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