Identifies the originating protocol and signaling of a FGD or local trunk group.
VALID ENTRIES:
TC = Exchange Access Tandem Signaling – CCS
TA = Exchange Access Tandem Signaling – MF
TS = Traditional Signaling
EC = Exchange Access – CCS Signaling
EA = Exchange Access – MF Signaling
OA = Traditional – Operator Service Signaling – Inband
OB = Traditional – Operator Service Signaling – Expanded Inband
OC = Traditional – Operator Service Signaling – Multi-Wink
OD = MOSS – Modified Operator Service Signaling – Inband
OE = MOSS – Modified Operator Service Signaling – Expanded Inband
OF = MOSS – Modified Operator Service Signaling – Multi-Wink
OG = EAOSS – Exchange Access Operator Service Signaling – Inband
OH = EAOSS – Exchange Access Operator Service Signaling – Expanded Inband
OI = EAOSS – Exchange Access Operator Service Signaling – Multi-Wink
OJ = CCS/SS7 – Operator Service Signaling – Inband
OK = CCS/SS7 – Operator Service Signaling – Expanded Inband
OL = CCS/SS7 – Operator Service Signaling – Multi-Wink
NOTE 1: An entry of “TS” is valid only on trunk groups used for 8YY/9YY traffic and is based on provider tariffs/contracts/practices.
NOTE 2: An entry of “TC” or “TA” indicates the requirement for network signaling information necessary to route calls from a provider end office through an access tandem.
NOTE 3: Entries of “TC” or “TA” are prohibited when the entry in the TGTYP field is “B”, “D” or “F” or "G".
USAGE: This field is conditional.
NOTE 1: Required when the first position of the TQ field on the ASR Form is “D”, “T”, “L”, “M”, “W” or “X” and the TG ACT field is “N” or “M”.
NOTE 2: Optional when the first position of the TQ field on the ASR Form is “D” or “T” and the TG ACT field is “D”, “C”, “F” or “K”.
NOTE 3: Otherwise prohibited.
DATA CHARACTERISTICS: 2 alpha characters
EXAMPLE: T S