[asterisk-users] phone status question

[Rilawich Ango]

Hi,
A makes call to B.  B has connection problem with the server (say, the
lan cable is unplugged).
1: A ---> server
2: A <--- server
3: server ----> B

In 2, server will send the ring to A and it will hear ringing tone.
In 3, server will try to connect B until timeout.

My question is:
A will still wait for B but B is physical unreachable.  Can I set the
number of retry time in server to try to reach the destination instead
of the timeout?