Switching to VoIP

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Chapter 14: Traditional Apps on the Converged Network

Don’t have an LDAP server? You could use Asterisk’s built-in data-

base commands to resolve DIDs to email addresses, instead.

Chapter 17’s dial-plan command reference covers these commands.

For those who prefer PDF files

In the last project, we used the tiff2ps command to create a printable version of the

fax, but with a few extra steps, we can turn it into a PDF file, too. PDF may be pref-

erable to TIFF when using email as we are in this project. Consider the following

dial-plan changes to the

[inc-fax] context:

exten => s,105,System('tiff2ps -2eaz -w 8.5 -h 11 ${TIFFILE}| ps2pdf \

>${TIFFILE}.ps')

exten => s,106,System('uuencode ${TIFFILE}.ps uuenc | mail -s fax ${EMAIL}')

exten => s,107,System('rm -f ${TIFFILE}*')

Now, instead of just encoding the TIFF file and emailing it, the file is converted to a

PostScript file, then to a PDF file, before being uuencoded and emailed to the appro-

priate recipient.

Simulating T.37

This project can be taken one step further, to crudely simulate T.37—that is, using

SMTP to trunk faxes back and forth between email systems that have analog fax end-

points connected to them. In a scenario with three offices and multiple fax machines

at each office, you could build a fax bank that routes the faxes ...