Registration cisco 7911G on freepbx server

I am trying to registrate cisco 7911G phone on my asterisk freepbx server.But i cant registrate my phone…server returns me error like this

[2018-10-19 14:20:52] ERROR[10593]: pjproject:0 <?>: sip_transport.c Error processing 2103 bytes packet from UDP : PJSIP syntax error exception when parsing ‘Request Line’ header on line 1 col 1:

Wat can i do with that?can u help me pls?

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