I am NOT familiar with YOUR make and model of phone, BUT.... I've had several cordless phone systems over many years, and have had the same problem that you describe. First, here is some background info for you:
The telephone company systems USUALLY have two different dialing systems:
- The "old" ROTARY DIALS worked by MECHANICALLY sending out different numbers of electrical pulses which the MECHANICAL "receivers" at the phone company "Central Office" buildings would read and thus connect you to the dialed number.
- Some years ago, a "new" dialing system was initiated. That system was called Dual-Tone-Multi-Frequency [or for short, DTMF].
DTMF uses BUTTON KEYS which put out a different electronically generated TONE [related to] for each different NUMBER key pushed, and THAT series of tones told/tells the phone company Central Office receiver computer the number to which you wanted to be connected.
Around the world over the years, most phone companies have, and still use one of these two dialing systems, AND...
Most cordless phone manufacturers designed their phones to work WITH EITHER system, BUT....
The customer IS REQUIRED to "SELECT" which system his phone company uses, while the customer is "SETTING UP" his/her new cordless phone.
THAT process IS INCLUDED in ALL cordless phone set-up instruction packages I've ever seen!!!!!!
Either you need to carefully read and study YOUR installation-set-up instructions and then PROPERLY set your phone's dialing system [to PULSE or DTMF], OR GET SOMEONE who KNOWS WHAT he, or she is doing to do it for you.
I, and I think no one else is able to guide you via back and forth messaging on this site. At least I know I can't because I'm not acquainted with your cordless phone, AND I don't have an instruction/set-up manual to consult!!!!!
Track down your manual, OR search for a replacement manual; the dialer system selection process is NOT DIFFICULT IF you have the manual!!!!!!!