Testing (con’t)
Cisco 3640 routers with VoIP cards
- good sound quality
- QoS, IP precedence options
- FXS card, connects to telephones, no problems
- FXO card, connects to PBX, many problems
- works at FNAL, not at CERN, DESY, SLAC
- many PBX phone jacks do not have supervisory disconnect
- connections stay up after both sides hang up
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