P2P SIP to DS-KH8350-TE1

[alexunderboots]

Good day. Can you tell me which template DS-KH8350-TE1 uses for incoming p2p sips?
I'm trying to make a call from Linphone to DS-KH8350-TE1 on the same local network. I get an error
SIP/2.0 403 Forbidden

I tried the templates:
sip:IP
sip:room@IP
sip:communitybuildingunitroom@IP
sip:0@IP
sip:0-0@IP