Specifying Fixed-Length Numbers

As a best practice, you should constrain telephone extensions and pager numbers to a fixed length. Fixed-length numbers can improve speech recognition, because they eliminate from the grammar all possibilities that are not of the specified length. The following properties in \vocera\server\properties.txt specify the number of digits in fixed-length phone extensions and pager numbers.

Table 1. Telephony properties for fixed-length numbers
Property Description

TelExtensionLength

Specifies the number of digits in an extension.

The default value is 0, which means that a variable length is accepted. A value of 1 through 7 specifies an extension of the given length.

TelPagerNumberLength

Specifies the number of digits in an internal pager system number.

The default value is 0, which means that a variable length is accepted. A value of 1 through 7 specifies a pager number of the given length. It can be used in conjunction with the Page Number voice command (for example, “Page number 1234”).

Note: If you modify the Properties.txt file, you must stop and start the Vocera Voice Server to load the properties into memory.