Comments on: Wireless Issues when making a VoIP call using a Linksys PAP2 and an Apple Airport Extreme Router http://www.enusbaum.com/blog/2007/12/15/wireless-issues-when-making-a-voip-call-using-a-linksys-pap2-and-an-apple-airport-extreme-router/ My little nerded out corner of the Internets! Wed, 03 Mar 2010 21:56:10 -0800 http://wordpress.org/?v=2.9.2 hourly 1 By: Mike http://www.enusbaum.com/blog/2007/12/15/wireless-issues-when-making-a-voip-call-using-a-linksys-pap2-and-an-apple-airport-extreme-router/comment-page-1/#comment-2377 Mike Thu, 27 Dec 2007 21:31:52 +0000 http://www.enusbaum.com/blog/2007/12/15/wireless-issues-when-making-a-voip-call-using-a-linksys-pap2-and-an-apple-airport-extreme-router/#comment-2377 I suspect that the high packet rate of a VoIP call (20ms intervals for RTP) is chowning the wireless chipset on the airport. This is pretty easy to test, you can simulate a VoIP packet rate using a laptop on the wireless and then doing some simple ping tests to compare. # ping -i 0.02 -c 500 -q [router_ip] Most wireless AP's are NOT capable of handling the high packet rate of VoIP calls. If you have SIP / QoS functionality turned on the Airport, I would turn it off. Anything that requires some sort of packet inspection is just going to slow down the packets. Hope that helps. Cheers! Mike I suspect that the high packet rate of a VoIP call (20ms intervals for RTP) is chowning the wireless chipset on the airport. This is pretty easy to test, you can simulate a VoIP packet rate using a laptop on the wireless and then doing some simple ping tests to compare.

# ping -i 0.02 -c 500 -q [router_ip]

Most wireless AP’s are NOT capable of handling the high packet rate of VoIP calls. If you have SIP / QoS functionality turned on the Airport, I would turn it off. Anything that requires some sort of packet inspection is just going to slow down the packets. Hope that helps.

Cheers!
Mike

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