Note: The telecommunications system may support the teleconference by providing audio, video, and data services by one or more means, such as telephone, telegraph, teletype, radio, and television.
Source: from Federal Standard 1037C and from MIL-STD-188
... SQF[?] SQG[?] SQH[?] SQI[?] SQJ[?] SQK[?] SQL SQM[?] SQN[?] SQO[?] SQP[?] SQQ[?] SQR[?] SQS[?] SQT[?] SQU[?] SQV[?] SQW[?] SQX[?] SQY[?] SQZ[?]
SRA SRB[?] SRC[?] ...
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