Dear Customer,
I have experience in developing SIP phones to connect calls to VOIP PBX servers such as, Asterisk. I am experienced in configuring dial plans, troubleshooting of CODEC incompatibility, etc. I have expertise in devloping the soft phones by using VOIP stacks compatble with Asterisk. I am Oracle Certified Professional. I have 6 years of Java programming experience. I can do this job. Thank you.