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S20 Mobiles that are indicated in forwarding do not work correctly.

Installed Yeastar S20 in Cyprus, the provider "Cablenet". Configured SIP trunk. 10 numbers.
There is a problem when calling to these numbers (all) from mobile, which are indicated for forwarding to internal numbers. It comes from the city, not giving a retreat, re-dial the number. When calling from the rest of the mobile there is no problem.
The firmware used was different. since the beginning of 2018. Firmware for today 30.10.0.34.
Where to look for a problem?

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