30:F7:0D00:07:7DD0:D0:FDA4:4C:11__________ SPA525G2 prior to HW 2.1.170:81:0500:27:0D68:EF:BD^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^What hardware variation is signified by the variouis MAC OUI?  Within the same declared hardware version?--$0 texting == xmp...

Having read the forum's guide on the topic , https://supportforums.cisco.com/docs/DOC-9806 , and related errata it's clear the phone can render MJPEG via RTSP.  The defect is the expectation of a needlessly specific URI PATH rtsp://10.20.30.40/img/jp...