VoIP-шлюз PLANET VGW-420FS 4-Port SIP VoIP Gateway (4*FXS): IETF SIP 2.0, T.38/T.30, STUN/Outbound Proxy, TLS/SRTP Security,VLAN, QoS, SNMP, TR069, Caller ID, DND, Three-way conference

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