Hello jenbur
I have gone through your project Grandstream UCM 6102 PBX Gateway Configuration
here we are for providing you the best service with my expertise in Asterisk PBX, Linux, PHP, System Admin, VoIP as we understand your requirement fully. and can provide you the best service
we are a organisation of website and application development services
I can do this within your budget too $15 - $25 USD / hour
Waiting for your responce
Thanks,
Mmadi