Avaya Media Processing Server Series System (Software Release 2.1) Manual de usuario descargar pdf (Pagina 225)

Common Configuration

# P0602477 Ver: 3.1.11 Page 225

User Datagram Mode

In both the client and server modes, VTCPD supports User Datagram Protocol (UDP)

host connections. This is specified by the -m U command line option. In UDP mode,

the host must extract the address and port number of VTCPD from the UDP message

to be able to reply to applications.

In UDP mode, an application can force the daemon to broadcast on the (local) network

by specifying a proper IP address in the SET command. For example,

ISSUE SET("vtcpd")

LABEL ("host:192.84.160.255 port:5000")

broadcasts on subnet 192.84.160.* and port 5000.

Normally, VTCPD in a client mode uses an ephemeral port number, obtained from the

kernel. The option

vtcpd ... -u port ...

allows the user to specify the UDP port number on which to listen for replies from the

server. The option has no effect in a server mode or in non-UDP mode.

Attaching to VMST

VTCPD can attach to any specified instance of VMST running on a LAN-based host

node. If the target VMST resides on another machine, the name of target node must be

specified on the command line. To attach to VMST, VTCPD has to use one of the

service ports specified in the The /etc/services File on page 129.

If there is a need to process messages with different formats, several VTCPD daemons

may be attached to the same VMST. In this case, each VMST must have a unique

name (defined in the services file) and be specified on the command line.

Applications address a particular instance of VMST by its defined name.

vtcpd [-m U]

Arg: -m U Specifies UDP mode. In this mode, the host must extract the

VTCPD address and port number from the UDP message to be

able to reply to an application.

In the UDP mode, the daemon usually cannot determine when the host goes

down. Therefore, the application does not receive a hostdown condition if the

host becomes unavailable. (A hostdown condition can only occur if VTCPD

receives a corrupted message from the host.)

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Avaya Media Processing Server Series System (Software Release 2.1) Manual de usuario Pagina 225