Using the 50% Rule for Calculating VoIP Traffic in a Converged Access Offering.

After the SIP Trunking and Interconnection Webinar we held a couple of weeks ago, we thought it would be helpful to give a little bit more detail on the 50% Rule, so below is a short list of things to remember.

• Always remember that it is the upload speed that is the critical speed for calculating SIP traffic.
• In symmetric offering like T-1 or sDSL/shDSL access the upload and download speeds will be the same.
• In cable, aDSL, some FTTH offerings the download speed will significantly lower than the upload speed.
• Also remember with all DSL access that the speeds decrease dramatically with distance, especially beyond 2 miles from the local Telco distribution point
• Always use a bandwidth tester/probe from the customers premise to determine the actual bandwidth that the customer has available for all applications (Voice, Data VPN etc).
• Make sure you account for intermittent traffic or latency sensitive traffic (PoS and VPNs) that may be affected or may affect the VoIP traffic on the Converged Access connection.
• Always consider that 50% of the Upload bandwidth (in Kb) to be the maximum amount of bandwidth that is available for VoIP traffic for the Access connection used.
• Take that number (in KB) and divide it by 40 for traffic that uses G.729 Voice protocol and 85 for traffic that uses G.729 Voice protocol to determine the maximum number of SIP Trunks that can be activated on a Converged Access pathway.

Miss the GLOBALINX SIP Trunking and Interconnection Webinar?
Watch it Here.