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- Mfr. Part #: QX-00IP-0004
- This phone expansion key enables 4 additional local IP phone extensions on all QX systems
- The QX20 can go up to a maximum of 32 total IP extensions
- The QX50 can go up to a maximum of 48total IP extensions
- The QX200 can go up to a maximum of 200 total IP extensions
- The QX500 can go up to a maximum of 500 total IP extensions
- The QX2000 can go up to a maximum of 2,000 total IP extensions
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