| Brand | Grandstream |
|---|---|
| MPN | GBX20 |
Check the listing for details. Grandstream GBX20 Extension Module. Condition: New. Listed at 130.99 USD. The GBX20 supports a wide-range of advanced call features including BLF, call park /pick-up, speed-dial, presence, intercom, voice conferencing transfer/forward and much more. Grandstream GBX20 Features.
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