GBX20 – Extension Module
- Connects to GRP2615 Carrier-Grade IP Phone and GXV3350 Video IP Phone
- 40 extensions per module with 2 page swtich keys (20 per page)
- Daisy chain up to 4 models for a total of 160 extensions
- 3 inch (272×480) TFT color LCD
- Local GUI: Multiple line/call appearances
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