| | |
| GR-57 | Functional Criteria for Digital Loop Carrier (DLC) Systems | Oct 2001 |
| GR-570 | LSSGR: Speed Calling, FSD 01-02-1101 | Jun 2000 |
| GR-571 | LSSGR: Call Waiting, FSD 01-02-1201 | Jun 2000 |
| GR-572 | LSSGR: Cancel Call Waiting, FSD 01-02-1204 | Jun 2000 |
| GR-573 | LSSGR: Business Group Call Waiting, FSD 01-02-1205 | Jun 2000 |
| GR-574 | LSSGR: Business Group Automatic Callback, FSD 01-02-1240 | Jun 2000 |
| GR-575 | LSSGR: CLASS Feature: Calling Identity Delivery on Call Waiting, FSD 01-02-1090 | Jun 2000 |
| GR-577 | LSSGR: Three-Way Calling, FSD 01-02-1301 | Jun 2000 |
| GR-578 | LSSGR: Usage-Sensitive Three-Way Calling (FSD 01-02-1304) | Sep 2003 |
| GR-579 | LSSGR: Add-on Transfer and Conference Calling Features, FSD 01-02-1305 | Jun 2000 |
