Our Vtech IA5854 5.8 GHz cordless phone has no ring tone. We tried a firm reset and also determined that it is not the service provider. How do we fix it?

SOURCE: user manual

need copy of manual for vtech 5.8ghz cordless phone with 2
additional handsets in english.

SOURCE: My Phone will not connect to the base unit...

My handset displays CONNECTING...
Move the handset closer to the telephone base. You might have moved out of range.

This is what was listed in the Vtech Manual.

What I suggest is not just powering it off, but remove battery and wait a couple of minutes. Put battery back in and try it. The other thing I suggest is a new battery or switching it temporarily with a phone that works, to see if that helps before you buy a new one. If the battery is weak it will have trouble reaching the base.

SOURCE: My vetech cordless phone is not working

DO you have a 2 line model? If so check and make sure the conf (conference) button is not pushed as it will keep the line off-hook forever. Hope this helps!

SOURCE: my vtech cordless phone will not ring. message is ringer off. how to turn ringer on.

Does your handset have a PROG button? Press that, then press the VOL+ button until you come to RINGER VOL: OFF. Press SELECT button, then use the ^ (VOL+) key until you get the desired volume level. Press SELECT again, then OFF. You're good to go.

SOURCE: hi, how do you turn the ringer on of vtech 5.8 GHZ

http://www.retrevo.com/d/ds/progress?doc=415c14b0b538f65e013116610ddd5a8a

Click on the above for your manual and go to p7.
Hope it helps!