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Grandstream GBX20
| Type | Extension Module for GRP and GXP IP Phones |
| Display | 4.3" Color TFT LCD (272 × 480) |
| Programmable Keys | 20 physical keys per page |
| Virtual Keys | Up to 40 contacts per page |
| Pages | 2 pages |
| Total Contacts per Module | Up to 40 BLF / speed-dial contacts |
| Expansion Capacity | Supports up to 4 GBX20 modules connected together | Up to 160 programmable contacts/extensions |
| Compatible Phones | GRP2615 | GRP2624 | GRP2650 | GRP2650 |