Grandstream UCM6510 IP PBX with PRI support UCM6510 P PBX with 2x FXO, 2x FXS, 1x E1/T1/J1, 2x Ethernet for up to 2000 users

Grandstream UCM6510 IP PBX with PRI support UCM6510 P PBX with 2x FXO, 2x FXS, 1x E1/T1/J1, 2x Ethernet for up to 2000 users
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