Hello Nono,
welcome to the Polycom Community.
It is always useful to include the currently used Software version of all devices used as issues experienced may already be addressed in a newer release.
This also allows yourself and others to check against current software release notes.
Usually, without looking into this without any details, its caused by an attempt to register and have incorrect credentials.
If you still suffer this issue please work with your Polycom reseller and ensure for future post's to provide minimum details as requested above.
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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Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge. If you need immediate and/or official assistance please open a service ticket through your proper support channels.
Please also ensure you always check the VoIP , Video Endpoint , Skype for Business , PSTN or RPM FAQ's
