Help Ringtone changed spontaneously, cannot reverse

[colc]

My HTC Desire v2.2 suddenly and without any input from me changed from my normal ringtone.
What I receive now is a voice message " home calling" or "unknown calling" etc.
I was not even aware that this configuration was even available; it is not in the list of ringtones.
The main problem is that it is not loud enough as I am often a distance from my phone.
The settings indicate that my normal ringtone is configured.
Any ideas?

 

[Hadron]

I only used the HTC software for a couple of months in 2010, so having to take a guess here. But maybe have a look in the "Accessibility" options and see if any speech option has been turned on.

Edit: a quick forum search turned up this thread, which tells you how to enable (and hence disable) this on a different but similar age HTC phone. It is indeed in the accessibility settings.

 

[colc]

In accessibility, accessibility is unchecked, Tasker and Caller and Announcer are both greyed out an unchecked

 

[Hadron]

Tasker is a third party app - what is that doing in the system settings??

Talkback, text to speech, anything like that?

 

[colc]

Tasker is a third party app - what is that doing in the system settings??
I assume that is where it was intended to be, I made no alterations to the installation
Talkback, text to speech, anything like that?
Nothing like that, I might add there is only one task configured, is not connected to ringtones, is is only to do with swtching on Bluetooth and WIFI when on the dock.