Call drop after 2 minutes and 50 seconds

Hi all,

i have a strange situation with my pbx. I have one trunk line and the inbound route is set to a misc destination (a mobile number). When i call to the line, the call will drop after 2 minutes and 50 seconds. (every-time)
In the log file i receive the following message:

ā€“ end of packet.
[2018-09-04 15:45:06] ERROR[2563] pjproject: sip_endpoint.c Error processing packet from Missing required header(s) (PJSIP_EMISSINGHDR) CSeq [code 171050]:
SIP/2.0 400 Bad From Header
Via: SIP/2.0/UDP;rport=5060;branch=z9hG4bKPj411b6899-5d62-424e-b814-ecf72e6cf473
Content-Length: 0

The same, if i call a mobile number from an extentison, the call will also drop after 2 min and 50 seconds

Did any of you encountered this issue before?
(ps. i have FreePBX

Thanks in advice,

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