для Cisco Cisco IOS Software Release 12.3(11)T

PSTN—public switched telephone network. Standard analog telephony infrastructure. 

S0(S/T)—Subscriber line designation 0 for subscriber terminals using 4-wire full-duplex interfaces 
containing two B channels + one D channel + monitor overhead. 

SLIC—Subscriber Line Interface Circuit. An IC providing central office-like telephone interface 
functionality. 

S/T—Interface 4-wire interface presented by an NT to TEs.

SIP—Session Initiation Protocol.

TE—terminal equipment. 

VoIP—Voice over IP. Blanket term that generally notes Cisco's standards based (H.323, and so on) 
approach to IP voice traffic.

VIC—voice interface card. A version of WIC but with a TDM I/F.

Refer to 

 for terms not included in this glossary.

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