I could get the blind (unconditional) call forward option working with the configuration that is provided in the IPTEL website but using the same config file and the ideas provided I couldn't get the call forward on busy and no answer working. I get the following error in the /var/log/messages:

May 16 15:49:52 localhost /usr/local/sbin/ser[17563]: ERROR: mk_proxy: could not resolve hostname: "ser.iptel.org"
May 16 15:49:52 localhost /usr/local/sbin/ser[17563]: ERROR: uri2proxy: bad host name in URI < sip:1234@ser.iptel.org>
May 16 15:49:52 localhost /usr/local/sbin/ser[17563]: ERROR: t_forward_nonack: failure to add branches
May 16 15:49:52 localhost /usr/local/sbin/ser[17563]: ERROR: w_t_relay (failure mode): forwarding failed
May 16 15:49:52 localhost /usr/local/sbin/ser[17563]: error: mediaproxy/sendMediaproxyCommand(): can't connect to MediaProxy
May 16 15:49:52 localhost /usr/local/sbin/ser[17563]: ERROR: sl_reply_error used: I'm terribly sorry, server error occurred (1/SL)

It would be of great help if anybody provide me input on how to resolve this issue or a configuration file using which I can get the call forward on busy and no response working. BTW, I am using the ser verison: 0.9.6 . I have populated an entry for call forward no answer/busy in the mysql database for the table "usr_preferences". Thanks in advance.