[SR-Users] help with string modification

[Sergey Basov]

Hello All.

I have some troubles with upstream sip switch.
It ignores SIP packets which contains:

User-Agent: FPBX-2.11.0(11.17.1)
or
Server: User-Agent: FPBX-2.11.0(11.17.1)

If space is present before first "(" then sip switch works as expected

So my question is: how corektly make analyze and modify this headers
using kamailio?
In which routes i must parse it?

i need such modifications:
User-Agent: FPBX-2.11.0(11.17.1) ->  User-Agent: FPBX-2.11.0 (11.17.1)
Server: User-Agent: FPBX-2.11.0(11.17.1) -> Server: User-Agent:
FPBX-2.11.0 (11.17.1)


Thank you.

--
Best regards,
Sergey Basov                     e-mail: sergey.v.basov at gmail.com