Routing Information Letters

Calls to Belgium To Require 10 Digits Instead of 9 Digits Cable Selection Code to Hawaii / Routing Codes for Mexico / Change of Overseas Traffic to 011-XXX Format / Inward WATS Tariff Changes Pre-Screening of Inward WATS Calls / Routing Problems to Mexico Puerto Rico Inward WATS Alascom Inward WATS Special Routing Instructions for San Bernardino Inward WATS Oklahoma City 4A ETS Phase Out and 191+NPA Routing Virgin Islands Inward WATS Pittsburgh 4A XB Phase Out and 191+NPA Routing Routing Changes Involving Distance Dialing to Additional Countries TWX Routing Changes / 212 NPA Exhaust / Rockdale Phase Out and Replacement by Atlanta 4ESS / Routing Error with SNET Changes to Use of TPMD (Terminating Point Master Deck) for Vacant Code Screening New Service for People with Impaired Speech and Hearing / Changes to the TRG / Satellite Avoidance for Conference Calls New Concept for "900" Service / 1980 Band Compression of 800 Service Quality Complaints on 800 Service Changes to Routing of 191+NXX Calls in St. Louis End of MRFUS / Change of NPA Code for Northwest Mexico / 800 Service Bands Conference Operator Satellite Avoidance - Network Operations Solution Through Routing Affectation (COSA NOSTRA) / Planned Code List Tariff Changes for WATS and 800 Service US and Canada Routing to Mexico / New IDDD Countries Additional Dialing Procedures for Operator Assistance in Mexico / Western Union Transfer Tandem Satellite Link Avoidance Routing / Domestic Satellite - 4A/4M ETS and No. 4ESS Toll Switching System - Special Routing Procedures Clarification to Mexican Dialing Procedures in RIL 29 IDDD to Qatar / Special Codes for 800 Service / Unblocking of E Digits / Non-Hierarchical Switching Systems / Index of RILs 800 Service in the US / IDDD to Mexico / Integrated Routing Assignment System (IRAS) for Network Routing Orders for Intertandem Switching Systems Conference Operator Satellite Avoidance / Long Lines Routing Plan / Special Codes Served - 800 New IDDD Countries 18X Codes for Routing to ISC / 191 + NPA 800 Service / New NPA 619 / International Record Carriers (IRC) ARGIS Continuation / New and Expanded NPAs / 191 + NPA ARGIS Continuation / 714/619 NPA Split / 312 NPA (Canada Only RIL) New IDDD Countries / Expanded NPAs / End Office Codes (EOC) Overseas CNRDB Forms / Delete and Prefix Information / Satellite Avoidance / Overseas 18X Codes / Special Announcement Code / Local Routing Mechanization Phase Out of 18X Code Conversion for IDDD First Stage Outpulsing 714/619 NPA Split / 713/409 NPA Split Routing Administration Change Reporting Procedures [Attachments Missing] Three Digit Numbers associated with LATAs Satellite Link Avoidance for Conference Calls / Routing Instructions for the Network Audio and Audio-Graphics Teleconferencing Service New IDDD Countries / Mexico 1XX Type Terminating Toll Center (TTC) Codes WATS Restructuring Planned for August 1, 1977 Western Union Discontinuance of TXW 60 Speed Subscriber to Communicate with a 100 Speed Subscriber Satellite Link Avoidance for Conference Calls Clarification to WATS Restructuring Details in RIL 5 Reporting Procedures for Eight Phase TWX Cutover to Western Union's Digital Exchange System (DES)