Multi-Tech Systems MVP210/410/810 사용자 설명서

Chapter 4: Configuring your VOIP 

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60 

 

Mode Direct, 

Client, or 
Registrar 

In direct mode, all VOIP gateways have static IP addresses assigned to them. 
In registrar/client mode, one VOIP gateway serves as registrar and all other 
gateways, being its clients, point to that registrar.  The registrar assigns IP 
addresses dynamically. 

 

Port 

The UDP port on which data transmission will occur.  Each client VOIP has its 
own port.  If two client VOIPs are both behind the same firewall, then they must 
have different ports assigned to them. 
If there are two clients and each is behind a different firewall, then the clients 
could have different port numbers or the same port number. 
(Default port number = 10000.) 

Re-transmission  

50 - 
5000ms 

If packets are lost (as indicated by absence of an acknowledgment) then the 
endpoint will retransmit the lost packets after this designated time duration has 
elapsed.  (Default value = 2000 milliseconds.) 

Max Re-
transmission 

0 - 20 

Number of times the VOIP will re-transmit a lost packet (if no acknowledgment 
has been received).  (Default value = 3) 

Client Option fields are active only in registrar/client mode and only for client VOIP 
units.  

Primary Registrar   -- 

This is the preferred SPP registrar gateway for controlling the traffic of the current 
VOIP. 

Alternate 
Registrar 1 and 2 

-- 

A first and a second alternate SPP Registrar gateway can be specified for use by 
the current VOIP for situations where the Primary Registrar gateway is busy or 
otherwise unavailable.  

Registrar IP 
Address 

This is the IP address of the registrar VOIP to which this client is assigned. 
(Default value = 0.0.0.0; effectively, there is no useful default value.) 

Registrar Port 

10000 or 
other 

This is the port number of the registrar VOIP to which this client is assigned. 
(Default port number = 10000.) 

Polling Interval 

integer 
60 - 300 

The interval between the VOIP gateway’s successive attempts to connect to and 
be governed by a higher level SPP registrar gateway.  The Primary Registrar is 
the highest level registrar gateway.  Alternate Registrar 1 is second; Alternate 
Registrar 2 is the lowest order SPP registrar gateway. 

Registrar Option fields are active only in registrar/client mode and only for 
registrar VOIP units. 

Keep Alive 

30 – 300 
(seconds) 

Time-out duration before a registrar will un-register a client that does not send its 
“I’m here” signal.  Client normally sends its “I’m here” signal every 20 seconds.  
Timeout default = 60 seconds. 

Proxy/NAT Device Parameters 

Behind 
Proxy/NAT 
device 

Y/N 

Enables MultiVOIP (running in SPP Registrar mode) to operate ‘behind’ a 
proxy/NAT device (NAT = Network Address Translation). 

Proxy/NAT 
Device 
Parameters – 
Public IP Address 

The public IP address of the proxy/NAT device which the MultiVOIP is behind.