My freeswitch is replying with me 400 Bad To Header whenever It receives Bye containing this To Header. 

To: 1111#15122031234 <sip:1111#15122031234@192.168.10.50:5060>;tag=NKU2jrZvFaK0j

But I wonder in the case of Invite containing, this header everything is fine. 

Is there something wrong with this header? (#?)

Best regards.