Question about Panasonic KX-T7433B Corded Phone

4 Answers

We have the Panasonic KX-T7433 model of phones at our office. Yesterday I set about to re-programme some of the extensions and now, as a result I have lost the outside line for the phones that I have been re-programming. The error note co not assigned. Please help!! My boss comes back tomorrow!!

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  • vanessarose Sep 19, 2008

    Hi there,

    We have a Panasonic KX-T7433 Digital phone system in our offices. I stupdily removed our access lines 1 and 3 by mistake. How do I program those lines so that I have access to the 3 lines instead of 1.


  • Anonymous Feb 25, 2009

    We get this " CO Not Assigned" error msg as well. Please help!

  • Anonymous Feb 26, 2009

    I was going to program a ONE TOUCH dialing (Page 18 of the manual)

    and I accidentally used our outgoing LINE 1 then I tried LINE 2.

    We have 3 lines. Now I only have LINE 3 as an outgoing line

    How do I REPROGRAM LINE ONE AND LINE TWO back to Outgoing Lines

  • Anonymous Feb 26, 2009

    I stupidly tried to program one touch dialing on our outgoing lines. Now they are not valid. How do I REPROGRAM them to outgoing lines again???

  • isabelm Mar 13, 2009

    This would have to be one of the most stupidly written owner manuals I think I have experienced. Same problem and no support on the panasonic site either. Much prefer the NEC version of this sort of phone.
    Sorry, not much help, but sometimes it's nice to know you're not alone.

  • kamyk_78 May 07, 2009

    I'm really frustrated because I have the same problem and noone could help me. What is more in user manual apear sentense "An outside (CO) line which is not assigned to a CO button cannot be dialed" - but there isn't any indication HOW TO DO IT !!! Fu....

    Finnaly I know how to solve this problem. You have to do on a phone: "program" -> "99" -> (chose button to which it will be assigned) -> "*" -> "program"

    see you



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Kamyk_78 has written correctly but he missed one step.

1) Press "PROGRAM"
2) Enter "99"
3)Chose button to which it will be assigned (generally 1 but it isn't from numpad, it is from lines from 1 to 24)
4)Enter "*"
5)Press "STORE"
6)Press "PROGRAM"

and it's done...

Posted on Jan 12, 2011

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I just found this, which had the process for programming a CO button as a one-touch. And it worked. It's a bit easier to follow than the panasonic manual so hopefully it will have an answer.

Posted on Mar 13, 2009

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Sounds like you have re-programmed a soft key to do another function.

How many phone lines do you have? Did you have a button for each phone line or were you using a single button to access an available outside line?

Do you have the programming manual for your phone system? Not just a user guide for the phone??

Posted on Jul 24, 2008

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While i talk with one line ,,,,,,anf if other line comes same time,my phone doesnt ring!!!!it only blinks.

Wats the solution for that???

Posted on Dec 08, 2009

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