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try changing phone to tone dialing . one phone line has been setup for Decadic dialing and the other line may be setup for tone dialing.
If tone dialing is working on one line but not the other then get phone company to change the dialing type on the phone line.
Dual tone multi frequency is the technical name for tone dialing and is more efficient than decadic dialing or pulse dialing.
This means that your phone line is short circuited somewhere.
The technical name for it is Partial line Lockout.
Try unplugging anything connected to the phone line, including modems, fax machines, house alarms etc (as faulty equipment can cause this), then try ringing home again. If it now rings, plug things in 1 at a time and ring each time to see what is causing it.
If it is still an engaged tone with everything unplugged, then the short circuit is on the phone line in the street and needs to be repaired by your telephone company.
Here's what the manual says:
Changing the Dial Mode (Tone or Pulse Dialing)
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.
Return the handset to the base. The handset communicates the new
setting to the base, and the base activates the setting on any other
Hope this helps out.
1) When the phone is in standby mode, press and hold the caller id/menu key. 2) Press the vol/ / key three times to select Dial. 3) Press the select key to toggle between Tone and Pulse. 4) Press the end key or return the handset to the base unit to complete the setting. The handset returns to standby mode. This phone also has a feature that allows you to use Pulse dialing to make calls, but allows you to switch to tone dialing for automated systems (like “Please Press 1 for English) here are the steps for that: Initially make your call with the pulse dialing mode. Once your call connects, press the */tone key. Enter the desired number. These digits will be sent as tone dialing. Once the call ends, the tone mode is canceled and pulse dialing mode resumes.
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.
If the 900MHZ phone is Model 26928M programming for rotary dial usually goes like below, can't hurt to try on any model.
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.