Ethernet overhead on VoIP This topic has 1 reply, 1 voice, and was last updated 21 years, 8 months ago by Webmaster. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts 12th April 2002 at 06:29 #21473 RobGuest I see that there is IP/UDP/RTP overhead with VoIP. Why is there no overhead from the Ethernet packet? 12th April 2002 at 09:36 #21474 WebmasterGuest There is, but the free calculators on this site don’t take it into account. Remember that Ethernet is a layer 2 (datalink) protocol, whereas IP/UDP/RTP are layer 3 and above. We have a product called VoIP Select which also takes into account layer 2 overheads for Ethernet, Frame Relay, PPP and ATM. Author Posts Viewing 2 posts - 1 through 2 (of 2 total) The forum ‘Voice over IP’ is closed to new topics and replies.