I am trying to figure out the necessary bandwidth for good quality VoIP calls. The situation is our company has International branches that use IP phones and in some areas (ie. Countries in Africa) the QoS is poor. These countries only use 1 IP phone. I do not know their bandwidth/ISP situation, but I do understand it relies heavily on available/dedicated bandwidth.
What I need is a general overall guidance of the bandwidth needed per IP Phone connection (ie. 100 kbps) and some of the factors that can deteriorate the QoS (ie. weather, equipment, web browsing etc.). I also need to pass this info to non-technical people so they will know what they have/can do to improve IP voice calls.
We will be improving our Voice communications sometime in the new year, but I need an interim solution.