[Serusers] Registeration failed

[mukesh]

Hi friends,
	I have successfully installed SER with MySQL support on my linux
machine (having public ip) and have added to users leo and mukesh.
	
	I have exported SIP_DOMAIN as
	# export SIP_DOMAIN=ims.myserver.com	
	and added "export SIP_DOMAIN=ims.myserver.com" to /etc/profile as
well

First Problem 
---------------------------
If I try below...

# /usr/local/sbin/serctl ping sip:mukesh at ims.myserver.com   
[1]+  Done                    cat <$path | filter_fl  
500

Below is error log extracted from /var/log/messages

Sep 15 10:37:30 oradb1 ser:  2(3911) ERROR: mk_proxy: could not resolve
hostname: "ims.myserver.com"
Sep 15 10:37:30 oradb1 ser:  2(3911) ERROR: uri2proxy: bad host name in URI
<sip:mukesh at ims.myserver.com>
Sep 15 10:37:30 oradb1 ser:  2(3911) ERROR: uri2sock: Can't create a dst
proxy
Sep 15 10:37:30 oradb1 ser:  2(3911) ERROR: get_hfblock: send_sock failed
Sep 15 10:37:30 oradb1 ser:  2(3911) ERROR: fifo_uac_error: no mem for hf
block
-----------------------------

Second Problem
--------------
How can I configure my Nokia6680 as UA (It has SIP support)? 


any kind of help/suggestion is highly appreciated.

Regards
Mukesh Kumar