Multi-Tech Systems MVP210-SS ユーザーズマニュアル

14 

for the MVP810SS) constitutes a practical limitation on their capacity to 

support PSTN access for other gateways.  Systems must be scaled to 

match required capacity by including additional MultiVOIP-SS units. 
Mounting.  Mechanically, the MVP410SS and MVP810SS MultiVOIPs 

are designed for a one-high industry-standard EIA 19-inch rack 

enclosure.  The product must be installed by qualified service personnel 

in a restricted-access area, in accordance with Articles 110-16, 10-17, and 

110-18 of the National Electrical Code, ANSI/NFPA 70.  
Phone System Transparency.  These MultiVOIPs inter-operate with a 

telephone switch or PBX, acting as a switching device that directs voice 

and fax calls over an IP network.  The MultiVOIPs have “phonebooks,” 

directories that determine to who calls may be made and the sequences 

that must be used to complete calls through the MultiVOIP.  The 

phonebooks allow the phone user to interact with the VOIP system just 

as they would with an ordinary PBX or telco switch.  When the 

phonebooks are set, special dialing sequences are minimized or 

eliminated altogether.  Once the call destination is determined, the 

phonebook settings determine whether the destination VOIP unit must 

strip off or add dialing digits to make the call appear at its destination 

to be a local call. 
Voip Protocol.  The MVP-SS units use the SIP protocol only.  (“SIP” 

means Session Initiation Protocol.)    
Data Compression & Quality of Service.  The analog MultiVOIP unit 

comes equipped with a variety of data compression capabilities, 

including G.723, G.729, and G.711 and features DiffServ quality-of-

service (QoS) capabilities.  
PSTN Failover Feature.  The MultiVOIP can be programmed to divert 

calls to the PSTN temporarily in case the IP network fails.  
RADIUS Support.  Inter-operation with a RADIUS server allows for 

call accounting (especially for billing) on a voip system.  The MultiVOIP 

supports inter-operation with RADIUS servers for the RADIUS 

accounting function (but not the RADIUS authentication function).   
STUN Support.  The STUN protocol (Simple Traversal of UDP through 

NATs (Network Address Translation)) assists with the packet routing 

functions of devices behind NAT firewalls or routers.  The MultiVOIP 

supports inter-operation with STUN servers and NATs (SIP based 

environment only).   
Management.  Configuration and system management can be done 

locally with the MultiVOIP configuration software.  After an IP address 

has been assigned locally, other configuration can be done remotely 

using the MultiVOIP web browser GUI. Remote system management 

can be done with the MultiVoipManager SNMP software or via the