DEAR,
BELIEVE ME AT ONCE PLEASE!
I am an enthusiastic and experienced developer of system configuration and management.
I always attach most weight to high quality of product, the shortest time of performing period.
I have 3+ years of experience in the configuration and maintenace of various server and services such as Email, VoIP, Samba, DNS, DDNS, Nagios, CaCti, cPanel, WHM, etc.
Specially, I have experience of developing VoIP server and client such as Asterisk.
The cracked reason maybe you said or other such as sip configuration..
I will do my best to resolve this problem, because I am very interested in VoIP development and configurations.
I will wait your reply.
Thanks.
Best Regards.