Yealink T22P new call issue

[Asterisk]

Hi,

I have encountered a problem with T22P phone. The issue is as follows.
1. T22p gets incoming call and answers.
2. Puts the call on hold (so far so good)
3. T22p user presses new call button and types new number on the same line.
4. Gets "unknown url scheme" on the screen. No invite goes from the phone.

I cant get to figure this out. I went through all the settings and could not find any related feature.

firmware of the phone is 7.72.0.75

i would appreciate some advice..

Thanks,
Dragan