Yeastar is checking the number format from the "From" field in the INVITE for incoming calls.

That means, that if you get national format from the INVITE you have to configure your DIDs in national format (044xxxxxxx)

INVITE sip:rssw@185.147.9.153:63442 SIP/2.0
From: <sip:044xxxxxxx@185.185.32.60>;tag=sc2nxp3-33d7bed0a94e0d26
To: <sip:052xxxxxxx@185.185.32.60>
Call-ID: 3ad5c0b372b52fc7183fe8856f538811@185.185.34.156:5060
CSeq: 1 INVITE
Allow: INVITE, ACK, CANCEL, BYE, OPTIONS
Max-Forwards: 68
User-Agent: AareSwitch/6.12.12884
Session-Expires: 1860;refresher=uas
Min-SE: 90
Supported: timer
Via: SIP/2.0/UDP 185.185.32.60:5060;nat;uac=sc2;branch=z9hG4bKsc2nxp3-338a968459448849
Contact: <sip:052xxxxxxx@185.185.32.60:5060>
Content-Type: application/sdp
Content-Length: 243
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