Hi, we have build WHMCS module for CDR billing for VOIP softwares. We already worked for 2600hz kazoo cluster that deals with VOIP accounts. Share your details we will deliver you the complete work in given time.
We work on SIP, VOIP and telephony servers too. We will give you dummy module after testing on that you have to create some milestone payment and than we will deliver you the complete work.
We work on one project at a time, so our completion time is very less.
Please review the proposal and share the details to start working.
thanks