Mitel Deutschland GmbH 68635RFP36U-01 ユーザーズマニュアル
SIP-DECT OM System Manual
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To enable this feature, the administrator must set the ”Truncate Caller Identification” parameter in the
OMP
OMP
System -> SIP -> Supplementary Services menu.
3.15 SYSTEM REDUNDANCY
The SIP-DECT solution offers a number of features to support system robustness and redundancy.
3.15.1 OMM STANDBY
The OMM is the central management entity in a SIP-DECT system and therefore constitutes a single
point of failure. It is possible to automatically transfer the OMM function to a second DECT base station
in case of failure or loss of network connection (see section 7.15).
point of failure. It is possible to automatically transfer the OMM function to a second DECT base station
in case of failure or loss of network connection (see section 7.15).
In an OMM standby implementation, it could happen in rare cases that both OMMs become temporarily
active. In such a situation, all SIP-DECT users are SIP registered from to the configured PBX both
OMMs. This can cause problems if the PBX accepts only one registration per user (non-forking proxy).
active. In such a situation, all SIP-DECT users are SIP registered from to the configured PBX both
OMMs. This can cause problems if the PBX accepts only one registration per user (non-forking proxy).
To prevent this scenario, SIP-DECT has a mechanism to detect situations with two active OMMs. When
such a situation is detected, the remaining active OMM will SIP re-register all users to the PBX.
such a situation is detected, the remaining active OMM will SIP re-register all users to the PBX.
This mechanism can be enabled/disabled through the “SIP reRegister after 2 active OMM failover”
parameter in the OMP
parameter in the OMP
System -> SIP-> Supplementary Services menu (see section 5.4.3.6)
3.15.2 BACKUP SIP PROXY/REGISTRAR
To increase the operational availability of the system in critical environments like hospitals, the OMM
offers a new failover mechanism for the SIP server. Therefore, in addition to the primary proxy, outbound
proxy and registrar server, it is possible to configure two additional levels of backup servers named
“secondary” and “tertiary” servers (see section 7.20.3).
offers a new failover mechanism for the SIP server. Therefore, in addition to the primary proxy, outbound
proxy and registrar server, it is possible to configure two additional levels of backup servers named
“secondary” and “tertiary” servers (see section 7.20.3).
In addition, a keep-alive mechanism implemented in the OMM allows the automatic failover to
secondary/tertiary servers or automatic coming back to primary servers (see section 7.20.4).
secondary/tertiary servers or automatic coming back to primary servers (see section 7.20.4).
3.15.3 CONFIGURABLE USER ACCOUNT FOR STANDBY CHECK
The “Standby OMM” feature of SIP-DECT allows configuration of the user account to be used to check
the availability of the iPBX. An availability check starts automatically in fail over situations.
the availability of the iPBX. An availability check starts automatically in fail over situations.
The OMM starts a SIP registration for a specific DECT phone user and sends an OPTIONS request to
the configured SIP proxy. If there is an answer, the SIP proxy/registrar is considered reachable and the
standby OMM becomes active.
the configured SIP proxy. If there is an answer, the SIP proxy/registrar is considered reachable and the
standby OMM becomes active.
With previous SIP-DECT releases, the OMM used the user account with the lowest phone number for
the check procedure. To select a specific user account for this purpose, enable the “Used for visibility
checks” flag in the user settings (see section 6.10.4).
the check procedure. To select a specific user account for this purpose, enable the “Used for visibility
checks” flag in the user settings (see section 6.10.4).
Please note:
The “Used for visibility checks” flag can only be set for one user. The number
for visibility checks is shown under OMP
Status -> Users -> Number menu. If the flag is
not set for a specific user, the OMM uses the user account with the lowest phone number.