Yealink W52H and diversion ringtone

[honzaa]

Hello.
I have several W52H DECT phones and Yeastar S20 PBX. I am trying to set other ringtone, when someone call via trunk. I am able to set "Distinctive ringtone" in Inbound route on PBX, but I am not able to set another ringtone for this ringtone group in phones.

Second way is add all internal phones to Phone book and set another ringtone here. But there is no options to set ringtone, when I editing contacts.

When I export contact to xml, I see:

Code:

<contact display_name="john" office_number="105" mobile_number="105" other_number="" line="0" ring="1" group_id_name="0" default_photo="">

I try change ring attr from 0 to 2 but ringtone is still same.

Is any way to distinguish internal and external calls with this phones?

Thanks for any response! Honza