I sent this a week or so ago, but we have been having some difficulty with email, so I don't know if perhaps some replies were made that I didn't get... If anyone knows a good callerid link, I'd be interested in that too. By the way, is this topic I'm perpetuating OT? A PIC is involved, but it's mainly a callerid hardware posting, so i guess it is....

-dan

Picsters,

Does anyone have access to the DAA circuit modification schematic mentioned below? I am currently kludging a staff telephone arrangement where I provide the trunk (48V and ring generation) and I send callerid information via a bell202 modem from my PIC, through the modem, through a DAA, finally arriving at the staff phone. The callerid info I provide is custom, and just tells the staff what room number has called into the system from a separate telco line that also comes into my circuit. In essence, my kludge involves blocking the trunk DC with a cap on the tip line between my DAA and my staff phone so that I can leave the DAA offhook at all times thereby avoiding the 2 second billing delay imposed by the DAA and allowing me to get callerid info through after I ring the staff phone.

Pretty kludgy, so I'm looking for the simple modification mentioned below.... I have nosed around the web, but have been unsuccessful.

>

>DATA ACCESS ARRANGEMENT (DAA) REQUIREMENTS

>To receive CND information, the modem monitors the phone line

>between the first and second ring bursts without causing the DAA

>to go off hook in the conventional sense, which would inhibit the

>transmission of CND by the local central office. A simple

>modification to an existing DAA circuit easily accomplishes the task.

>

>

>-----Original Message-----

>From: Chaipi Wijnbergen [mailto:chaipi@TOHU0.WEIZMANN.AC.IL]

>Sent: Thursday, September 16, 1999 11:09 AM

>To: PICLIST@MITVMA.MIT.EDU

>Subject: Caller ID specifications

>

>

>Hi All,

>

>If you are interested with CallerID, here are some specifications:

>

>http://www.ee.washington.edu/eeca/text/callerid/spec.html

>

>Chaipi

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