Hello @Viktor.ar,
welcome to the Polycom Community.
I believe we use the P-Asserted-Identity but I would need to see a log or a trace to verify this or simulate this.
As this is outside the scope of the Polycom community I suggest you get this via your organisation into Polycom support.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services
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