Pulse and tone

You can download the manual at
http://www.home-electronics.net/USER-GUIDES/26928_DOM_ES_CL_IB.pdf

depends on the telephone exchange . Suggest switching to Tone signalling . MTDF - https://en.wikipedia.org/wiki/Pulse_dialing
Old technology- Pulse or Decadic Signalling - the line is broken by a relay contact or if even older a rotary dial manual switch contact - Dial a 9 you would break the line connection 9 times and send nine pulses.
Tone sends two frequency tones that encode the number that you selected and is a much faster dialing system and more modern method.

Here's what the manual says: Changing the Dial Mode (Tone or Pulse Dialing) (HS1 only) Your phone can communicate with the telephone network in two different ways: tone dialing or pulse dialing. These days, most phone networks use a method called tone dialing, so your phone comes programmed for tone dialing. If your phone company uses pulse dialing, you need to change your phone's dial mode. If you don't get a dial tone or can't connect to the telephone network, follow the steps below to modify your phone?s settings: With the phone in standby, press and hold [cid/menu]. Press [vol/ / ] to move the pointer to select DIAL. Press [select/channel] to set the phone to pulse dialing. Press [end]. Return the handset to the base. The handset communicates the new setting to the base, and the base activates the setting on any other handsets. Hope this helps out. K

Dial tone is OK, but can't dial out
• Make sure the tone/pulse setting is programmed
correctly.
TONE/PULSE DIALING
1. Make sure the phone is OFF (not in TALK mode).
2. Use the CID/VOL left (-) or right (+) arrow button to
scroll to 1TONE or 2PULSE, or use the touch tone
pad on the handset to enter the desired setting. For
example, to choose TONE dialing, press the number 1
key. 1TONE is the default setting.
3. Press flash/program to store selection. You will hear a
confirmation tone.

press menu then globel setup and then press dial mode then change the the dial tone you want

Lisa, If the 900MHZ phone is Model 26928M programming for rotary dial usually goes like below, can't hurt to try on any model. TONE/PULSE DIALING This adjustment allows you to select tone (touch-tone) or pulse (rotary) mode dialing. The phone is pre-set for touch-tone use. To set to tone or pulse dialing: 1. Press and hold the program button for two seconds. You will hear a beep. 2. Press the *tone button to select Tone Dialing or press #pause to select Pulse Dialing. 3. Press the program button again. You will hear a confirmation tone.

I found a manual from AT&T that had the information I needed. Thanks!

TONE/PULSE DIALING
1. Make sure the phone is OFF (not in TALK mode).
2. Use the CID/VOL left (-) or right (+) arrow button to
scroll to 1TONE or 2PULSE, or use the touch tone
pad on the handset to enter the desired setting. For
example, to choose TONE dialing, press the number 1
key. 1TONE is the default setting.
3. Press flash/program to store selection. You will hear a
confirmation tone.

yea.. this happeneded to me aswell.. here's what you do: (this is in the manual btw) TONE/PULSE SETTING 1. Make sure the phone is OFF (not in TALK mode). 2. Press the program button. 3. Press * tone button for tone or # pause for pulse selection. 4. Press the program button again. You will hear a confirmation tone.

Per the instruction manual, there is supposed to be a switch on the base (look on the back or bottom) for TONE/PULSE mode. Here is a link to the manual: http://www.home-electronics.net/GE/ProductDownloads/25881EE3_IB.pdf In the "troubleshooting" section, there is this entry: Dial tone is OK, but can?t dial out: Make sure the TONE/PULSE setting on the base is set to the type of phone service you are subscribed to.