Hello lumber_jack,
welcome to the Polycom Community.
The phone in this case behaves as working as designed.
If we receive such an event we will interrupt active calls. This is a critical part of making the BroadWorks Commpilot Call Manager work seamlessly (VOIP-81019).
This is going back to our SPIP and SSIP Phones and any change to this would require a feature request.
Jan 03, 2013 Question: How can I request a change to the current Polycom SIP / UC Software?
Resolution: Please check => here <=
Again not having complete logs and / or a full wireshark trace its difficult answering this.
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