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SIP Cisco IP Phone 7931G & BLF

Good Afternoon,

We currently have 2 Cisco IP phones connected to a 3CX phone system.  These phones are registered on the system properly, however the phones themselves are throwing 500 Internal Server Errors in response to BLF notify events.

Has anyone come across this before and have an answer to resolving it?  The phones are setup using TCP and the system is returning application/pidf+xml for the content type.

Thanks,

Dan

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