I want kamailio use User-Agent header, not Server head

My setup is as follows: kamailio.cfg
server_signature=no
user_agent_header="User-Agent: carrierroute-kam"

the result is :
SIP/2.0 100 trying -- your call is important to us
Via: SIP/2.0/UDP xxx
From: xxxxxxtag=N856ZmNXa4S6D
To: xxx
Call-ID: 5ab0
CSeq: 82194 INVITE
Content-Length: 0

not have User-Agent header
please help me,How to make it appear the User-Agent field? thank you

version: kamailio 5.7.0 (x86_64/linux) f1e91d


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