Asterisk, Strong Networking, Care and Feeding

NY, NJ, PA locations. Must reside in this geography. Looking for someone who can provide ongoing support, enhancements, patches, future upgrades for multiple implementations of PBX in a Flash using SIP Trunking only. Anticipating 90% of effort can be done remotely; however, ability to travel to customer sites may be required every few months. Strong networking skills are necessary, familiarity with iptables and the following linux packages: apache, postfix, squid, bind, dhcp, LDAP, etc. I am looking for someone who can eventually take over these clients as their own. Your bid is your hourly rate for ongoing services.