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Managing Calls Using IP Telephony
November 2009 220
SIP/T38://+01-781-555-1212
ISDN://+01-781-449-9009
When the current FAX.C sample program is compiled, it takes
command line parameters to define the number dialed. With no
changes to the source code, you can replace the number with a URI
to allow it to take advantage of T.38. The sample program is
effectively IP-enabled purely by virtue of the dial string it uses.
In a SIP environment, the following command:
fax –u 0 –s xxxxx@brooktrout.com foo.pkt
initiates the following sequence of events:
1. Call control processes the URI dial string.
2. Sends it to the SIP protocol stack.
3. The SIP protocol stack sends it to the SIP redirect server.
4. The SIP redirect server tells the SIP stack where calls to
brooktrout.com should go.
Note: Redirect and proxy servers are optional. You can send an
INVITE directly to a user client.
5. SIP stack places the call there.
6. Remote SIP proxy optionally redirects call to where it ought to go.
If the phone number string contains a prefix or characters followed
by a colon(:) and the prefix is not SIP, the software sends a return
status indicating that the number the application dialed was invalid.