Cisco SPA500S - Expansion...
32 programmable multicolored LED buttons, Illuminated line status monitoring.
IP Phone Accessories
There are 19 products.
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Grandstream GBX20 extension...
The GBX20 is a backlit LCD extension module supported by the GXV3350 and GRP2615. The module includes 20 dual-colored extension keys and 2 arrow keys for page switching (allowing each GBX20 to support up to 40 contacts/extensions.). Connect up to 4 GBX20 modules to compatible Grandstream phones for a total of 160 contacts/extensions.
Grandstream GXP2200EXT...
The GXP2200EXT is the extension module that can be added to the GXP2140, GXP2200, and GXV3240 Enterprise IP phones.
