 | BRI = Basic Rate Interface, this is ISDN with 2 x 64Kbit/s (Europe) or 2 x 65 KBit/s (US)
|
| PRI = Primary Rate Interface, this is professional ISDN with 31 or 30 channels (from 32) with 64KBit/s (Europe) or 24 channels (from 26) with 56KBit/s (US)
|
| codec = the compression and decompression of digital data
|
| SIP = session interface protocol between IP voice gateways
|
| SS7 = signaling protocol 7 for PSTN communication from voice switch to voice switch or its periphals
|
| G.729 = the well used (or mostly used) codec for VOIP compression
|
| POTS = plain old telephone service = old wired anlaloque phone system
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| PBX = private branch exchange = private voice switches in small and medium companies or enterprises
|
| PSTN = Public Switched Telephone Network = the AT&T or British Telecom or German Telecom voice switch network
|
| E1
|
| T1
|
| E3
|
| T3
|
| DS3 |
