Expert Documentation

Chapter 6
As of R9.0, Alcatel-Lucent OmniPCX Office Communication Server allows the registration of
public Direct Dial In (DDI) numbers available in the public dialing plan. A maximum of 60 DDI
numbers can be registered. Public DDI registration is configured in OMC (Expert View), in
System > Numbering > Automatic Routing selection > Gateway Parameters.
6.4.2.3.7 Keep Alive Mechanism
The Alcatel-Lucent OmniPCX Office Communication Server supports two keep-alive
mechanisms for controlling the up/down status of the remote gateway.
"Stateless" Monitoring
At a regular time interval, the PCX sends an IP packet to the remote gateway and monitors the
reception of the awaited answer.
OMC configuration is used to select the keep-alive type of message emitted by the PCX which
can be either an ICMP message (ping) or a SIP Option message.
By default, the Alcatel-Lucent OmniPCX Office Communication Server uses ICMP message
(ping). A message is sent every 300 s.
Note:
The keep-alive mechanism is inhibited when DNS SRV is enabled.
To configure the keep alive mechanism:
1. By OMC (Expert View), select Numbering > Automatic Routing Selection > Automatic
Routing: Prefixes
2. Review/modify the following attributes:
Gateway Alive Protocol
Gateway Alive Timout/s
Select ICMP or SIP Option
Enter the periodicity (in seconds) of keep alive message
emission.
Enter 0 to inhibit the keep alive mechanism.
Active Session Monitoring (During a Call)
In the context of SIP sessions, the Alcatel-Lucent OmniPCX Office Communication Server
uses a session timer to check the activty of the remote party.
To keep the SIP session alive, UAs exchange periodic refreshing requests.
Two refreshing method are available using INVITE (with SDP) or UPDATE (without SDP)
requests in conformity with RFC 4028. A negotiation mechanism allows to define the
appropriate method depending on the context.
To configure the keep alive mechanism for SIP sessions:
1. By OMC (Expert View), select System Micellaneous > Memory Read/write > Debug
Labels > VOIPnwaddr
2. Enter the appropriate address Session timer value (see Public SIP Trunking -
Configuration procedure - Session Timer ).
3. Enter the appropriate address Do not Allow UPDATE value to enable/disable the
UPDATE method depending on the context (see Public SIP Trunking - Configuration
procedure - Do not Allow Update ).
6.4.2.3.8 Authentication
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