https://www.vds.co.ke/africa/grandstream-gxw4501-kenya/
Grandstream GXW4501 Digital VoIP Gateway - 1 T1/E1/J1, 30 Concurrent
Grandstream GXW4501 is a one T1/E1/J1 port gateway that converts digital phone signals to VoIP, letting you integrate your legacy equipment with your IP PBX
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