The VIP-851-25 and VIP-851-70/100 SIP 20W Amplifiers enable voice access to a single zone of one-way paging over an IP network, allowing page zones to be extended anywhere network connectivity is available. The VIP-851-70/100 has output connections for line level and 25-volt, 70-volt or 100-volt speakers. The VIP-851-25 has output connections for line level and 25-volt speakers only.