Least Cost Router section "Sofia-SIP"

Hi people!
I finally managed it to run my PTP ISDN Line. I simply thought of
checking out with git the latest sources of lcr.
I compiled on debian with ssl, sofia-sip and mISDN (default)

Inside the interface.conf section "sip", there is something like: "Use
Sofia-SIP as SIP point-to-point interface".
How do make use of it?!

# Use Sofia-SIP as SIP point-to-point interface
#[sip]
#sip <local ip>[:<local port>] <remote ip>[:<remote port>]
#sip 10.0.0.12 10.0.0.34
#earlyb no
#tones no


There was nothing written in the handbook, or I can find any
informations about it.
Does it mean that this will open an sip channel and I would call one
endpoint (let us say on my local pbx) and vice versa ?!

Do you have some samples ?! If it's the case, all my problems would be
solved in a row.

Please, provide me some infos. I would be really happy of it.






Tamer