
9
Voice Interface: E1/T1 PRI
One E1/T1 (digital) line consists of 30/23 Bearer channels (voice) and
1 Data channel (signaling)
Signaling is controlled by PSTN protocols, such as E1 ISDN PRI, E1
SS7 ISUP, E1 CAS DTMF/ R2, T1 ISDN PRI, T1 CAS
Used to connect with PSTN or legacy PBX
To meet the demand for huge-volume call traffic
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