Chapter 4 – Configuring Your MultiVOIP
66 MultiVOIP® Voice/Fax over IP Gateways
SPP Call Signaling Parameter Definitions
Field Name Values Description
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.
General Options
Port port The UDP port on which data transmission occurs. 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
retransmits the lost packets after this designated time duration has elapsed. (Default
value = 2000 milliseconds.)
Max Re-
transmission
0 - 20 Number of times the VOIP re-transmits a lost packet (if no acknowledgment has been
received). (Default value = 3)
Client Options 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
n.n.n.n 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 Options
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 un-registers 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
n.n.n.n The public IP address of the proxy/NAT device which the MultiVOIP is behind.
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