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Chapter 4: Configuring your VOIP
Multi-Tech Systems, Inc. 57
SIP Server Configuration
The MultiVOIP 210/410/810-SS models have the additional capability of SIP survivability. The settings for
SIP server mode are detailed below.
Figure 4-15: SIP Server configuration
SIP Server Configuration Parameter Definitions
Field Name
V
alues Description
Operating
Mode
Survivability
-or-
stand-alone
In “Survivability” mode, the MVP-SS unit can function as a SIP server for other
gateways in its network in case that network loses contact with the network’s main SIP
server (typically a PBX). When in “Survivability” mode the unit is a backup SIP server.
In “Stand-Alone” mode, the MVP-SS functions as a primary SIP server for other
gateways. In this mode, the MVP-SS operate to technical advantage with ‘smart’ SIP
phones. Such smart SIP phones can choose the SIP server under which they operate
and, consequently, can be controlled by either the SIP-based PBX or by the MVP-SS
Survivability
Status
Check
Register,
Options
One of two status-check packets is sent to the main SIP Proxy servers to which the
MVP-SS serves as a backup. This packet determines whether the MVP-SS needs to
take over SIP server functions or stay in its normal backup mode. “Options” and
“Register” are two distinct SIP request “methods.” The Options method solicits
information but does not set up a connection. The Register method conveys
information about a user’s location to the SIP server. The “Register” method may
entail more data overhead than the “Options” method. If both of these methods are
supported by your SIP server, it is OK to use either one. If only one is supported, use
the supported method.
Registrar Options
Allow
Undefined
Registrations
Y/N If undefined registrations are allowed, then gateways other than those listed in the
Predefined Endpoints list can register with the MVP-SS unit as it functions in its SIP
server mode. If undefined registrations are not allowed, then incoming registrations
will be allowed if they originate from endpoints at accepted domains or IP addresses.
Accept
Registrations
for:
any/specific
domains
Defines if registrations to the MVP-SS SIP server will be accepted from any domain or
only from specified domains. Multiple domains can be listed, separated by semicolons.
The “any domains” option is intended for private networks not accessible via Internet.
Domain
Names
name
Endpoints (separated by semicolon) from which the MVP-SS will accept registrations.
Accept
Registrations
for:
n.n.n.n
-or-
any IP
addresses
Determines whether registrations to the MVP-SS SIP server will be accepted from any
IP address or only from specified IP addresses. Multiple IP addresses can be listed
(separated by semicolon). The “any IP addresses” option is intended for private
networks not accessible via Internet or PSTN.
IP
Addresses
n.n.n.n
List of IP addresses (separated by semicolon) of endpoints from which the MVP-SS
will accept registrations.
Re-
Registration
Time
in seconds;
(default is
3600)
The time after which the UserAgent Client is supposed to register with the proxy
server. Expiration of the registration means that the gateway has lost contact with the
main SIP server and that the MVP-SS unit will enter ‘survivability’ mode. In
survivability mode, the MVP-SS unit will complete calls acting as a backup to the main
SIP server. Normally, the MVP-SS will initiate re-registration before the interval lapses.