Avaya Media Processing Server Series System (Software Release 2.1) Manual de usuario descargar pdf (Pagina 221)

Common Configuration

# P0602477 Ver: 3.1.11 Page 221

Single Connection to Host

The daemon can connect to the specified VMST or all VMST instances running on a

node.

In its most basic configuration, at startup, the VTCPD daemon connects to a single

host using the host name and TCP/IP port number that are specified as arguments on

the command line. (If a host name is not specified, VTCPD is configured as a server,

in which case it accepts connections on a specified port. See Server mode on page 224

for more information.)

To send a message to the host, an application uses the SEND function of the Resource

block in PeriProducer. When the application is expecting a response, it issues the

RECEIVE function of the resource block.

VTCPD must be able to associate received messages with application requests. To do

this, it uses a Message ID. Any request sent to the host from an application, and any

response from the host to the application, must have the same message ID. This way,

the daemon is able to route a received message to the correct application. VTCPD

provides several alternatives for the message ID. It will manage the ID on behalf of

the application or let the application assume complete control of the ID.

VTCPD can accommodate fixed or variable-length messages. The length of a

variable-length message can be specified as a 1, 2, or 4-byte binary value preceding

the message, or VTCPD can search for a delimiter character placed at the end of the

message.

Multiple Connections to Multiple Hosts

The VTCPD daemon may be connected simultaneously to several hosts. To do this,

each host must be specified on the command line when the daemon is started. No

priority is associated with any particular host. VTCPD sends messages on a

round-robin, load-balancing basis, and will assume that each host provides equivalent

services. The application can override VTCPD and choose a specific host, if

necessary.

VTCPD may make several connections to any host without giving priority to any

particular connection. Messages are sent on a round-robin and load-balancing basis.

(It is assumed that each connection provides equivalent services.) The number of

outstanding requests on a given connection can be limited, if required by the host. If

VTCPD cannot send a message to a host because this limit would be exceeded, it

returns a condition to the application.

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Avaya Media Processing Server Series System (Software Release 2.1) Manual de usuario Pagina 221