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Microphone expandability - Optional extension microphones increase coverage for larger size rooms (see Expansion Microphone accessory below)
Debut 4-port systems offer 50 mailboxes and up to five other box types
Extra wide
This card provides circuits for 4 Single Line Telephones (hence the SLT)
Panasonic DBS 576 VB-44510 Loop Start Trunk Card (8x0) (Refurbished) Southwestern Bell Microphone expandability - Optional extensionMore Information: Panasonic DBS 576 Loop Start Card, part # VB44510 Supports up to 8 loop start CO lines and can be installed in any flexible slot. Also provides lightning arresters and UL1459 safety circuitry, and can be directly connected to CO lines.
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