I have a IP406 v1.4(22) and I have 15 4612 IP phones running on a isolated subnet (not mixing voice and data) all phones have there own switch port 100MB HD. And ping times are about 1ms from the IP406 to the phones. All are set to G.711 Ulaw 64K, with fast start, out of band DTMF and allow direct media path enabled. All the IP phones are experiencing intermittent echo with outside calls. Any thoughts or recommendations will be appreciated.
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