When using simple bridge application in a dialplan

I am using leg_timeout which is default to 60 secs.

If I set call_timeout Freeswitch sends 480 after exactly 120 secs.

How can I increase this value? Is there any parameter for this?

Or is this value hardcoded in the source code?

If I have to change the source code to increase this value,

which source code do I have to modify?

I foud  the following line in the sofia lib tree,

NHP_SET(nhp, invite_timeout, 120);

but I am not sure this is the correct parameter or not.

Thanks,

Huseyin