TIA-1126.522 2008 Edition, July 1, 2008 S.R0125-522-0 v1.0 VoIP Supplementary Services Descriptions: Three Way Calling
TIA-1126.554 2008 Edition, July 1, 2008 S.R0125-554-0 v1.0 VoIP Supplementary Services Descriptions: Directory Assistance
TIA-1126.502 2008 Edition, July 1, 2008 S.R0125-502-0 v1.0 VoIP Supplementary Services Descriptions: Call Forwarding-Busy
TIA-1126.512 2008 Edition, July 1, 2008 S.R0125-512-0 v1.0 VoIP Supplementary Services Descriptions: Flexible Alerting
TIA-1126.555 2008 Edition, July 1, 2008 S.R0125-555-0 v1.0 VoIP Supplementary Services Descriptions: Inbound Call Restriction / Anonymous Call Rejection
TIA-1126.000 2008 Edition, July 1, 2008 S.R0125-000-0 v1.0 VoIP Supplementary Services Feature Descriptions
TIA-1126.508 2008 Edition, July 1, 2008 S.R0125-508-0 v1.0 VoIP Supplementary Services Descriptions: Calling Identification Presentation
TIA-1126.556 2008 Edition, July 1, 2008 S.R0125-556-0 v1.0 VoIP Supplementary Services Descriptions: Outbound Call Restriction
TIA-1126.503 2008 Edition, July 1, 2008 S.R0125-503-0 v1.0 VoIP Supplementary Services Descriptions: Call Forwarding–Default
TIA-1126.504 2008 Edition, July 1, 2008 S.R0125-504-0 v1.0 VoIP Supplementary Services Descriptions: Call Forwarding-No Answer
TIA-1126.552 2008 Edition, July 1, 2008 S.R0125-552-0 v1.0 VoIP Supplementary Services Descriptions: Call Hold
TIA-1126.551 2008 Edition, July 1, 2008 S.R0125-551-0 v1.0 VoIP Supplementary Services Descriptions: Abbreviated Dialing/Short Code Dialing