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Asterisk proces memory increase

Hello,

I notice that at the end of the day, after about 4000 calls have passed
my Asterisk-system, that the use of memory is very high and stays that
way untill a restart of Asterisk or a reboot of the server.

This is the situation at the end of the day :

[root@sp asterisk]# free -m
total used free shared buffers cached
Mem: 3923 1931 1992 0 268 1308
-/+ buffers/cache: 353 3569
Swap: 4031 0 4031

So total of 3923MB, where 1992MBis used and 1931MBstill free.

This memory never decreases and increases with every call that passes my
Asterisk system. After some more calls :

[root@sp asterisk]# free -m
total used free shared buffers cached
Mem: 3923 1934 1989 0 270 1309
-/+ buffers/cache: 353 3569
Swap: 4031 0 4031

So total of 3923MB, where 1934MBis used and 1989MBstill free.

As I said, only a restart of Asterisk or reboot of the server can
decrease this value :

[root@sp asterisk]# free -m
total used free shared buffers cached
Mem: 3923 974 2948 0 150 524
-/+ buffers/cache: 299 3624
Swap: 4031 0 4031

So total of 3923 MB, where 974 MB is used and 2948 MB still free.

So why does this memory usage only decrease with a restart ? What keeps
asterisk stored in the RAM-memory ? Even if there are 0 calls, the
memory does not decrease.