this kind of systems are possess and used by the company instead of a telephone organization. the phone can only be the supplier or services supplier of such items.
PBX systems allow conference phone calls. This https://donnayqiw815310.blazingblog.com/29617285/how-ip-pbx-dubai-voip-pbx-pbx-supplier-in-dubai-ip-pbx-system-dubai-can-save-you-time-stress-and-money